Before the Passover, we need to circumcise our hearts and those in our household, and clean them with the blood of the Lamb so that the LORD will pass over instead of striking us!

The First Passover (Exodus 12:21-28)

21. Then Moses called for all the elders of Israel and said to them, "Pick out and take lambs for yourselves according to your families, and kill the Passover lamb.
22. And you shall take a bunch of hyssop, dip it in the blood that is in the basin, and strike the lintel and the two doorposts with the blood that is in the basin. And none of you shall go out of the door of his house until morning.
23. For the LORD will pass through to strike the Egyptians; and when He sees the blood on the lintel and on the two doorposts, the LORD will pass over the door and not allow the destroyer to come into your houses to strike you.
24. And you shall observe this thing as an ordinance for you and your sons forever.
25. It will come to pass when you come to the land which the LORD will give you, just as He promised, that you shall keep this service.
26. And it shall be, when your children say to you, 'What do you mean by this service?'
27. "that you shall say, 'It is the Passover sacrifice of the LORD, who passed over the houses of the children of Israel in Egypt when He struck the Egyptians and delivered our households.' " So the people bowed their heads and worshiped.
28. Then the children of Israel went away and did so; just as the LORD had commanded Moses and Aaron, so they did.

Passover at Gilgal (Joshua 5:2-11)

2. At that time the LORD said to Joshua, "Make flint knives for yourself, and circumcise the sons of Israel again the second time."
3. So Joshua made flint knives for himself, and circumcised the sons of Israel at the hill of the foreskins.
4. And this is the reason why Joshua circumcised them: All the people who came out of Egypt who were males, all the men of war, had died in the wilderness on the way, after they had come out of Egypt.
5. For all the people who came out had been circumcised, but all the people born in the wilderness, on the way as they came out of Egypt, had not been circumcised.
6. For the children of Israel walked forty years in the wilderness, till all the people who were men of war, who came out of Egypt, were consumed, because they did not obey the voice of the LORD--to whom the LORD swore that He would not show them the land which the LORD had sworn to their fathers that He would give us, "a land flowing with milk and honey."
7. Then Joshua circumcised their sons whom He raised up in their place; for they were uncircumcised, because they had not been circumcised on the way.
8. So it was, when they had finished circumcising all the people, that they stayed in their places in the camp till they were healed.
9. Then the LORD said to Joshua, "This day I have rolled away the reproach of Egypt from you." Therefore the name of the place is called Gilgal to this day.
10. So the children of Israel camped in Gilgal, and kept the Passover on the fourteenth day of the month at twilight on the plains of Jericho.
11. And they ate of the produce of the land on the day after the Passover, unleavened bread and parched grain, on the very same day.

Passover In Jerusalem (OT) 2 Chron 34:14-35:2

14. Now when they brought out the money that was brought into the house of the LORD, Hilkiah the priest found the Book of the Law of the LORD given by Moses.
15. Then Hilkiah answered and said to Shaphan the scribe, "I have found the Book of the Law in the house of the LORD." And Hilkiah gave the book to Shaphan.
16. So Shaphan carried the book to the king, bringing the king word, saying, "All that was committed to your servants they are doing.
17. And they have gathered the money that was found in the house of the LORD, and have delivered it into the hand of the overseers and the workmen."
18. Then Shaphan the scribe told the king, saying, "Hilkiah the priest has given me a book." And Shaphan read it before the king.
19. Thus it happened, when the king heard the words of the Law, that he tore his clothes.
20. Then the king commanded Hilkiah, Ahikam the son of Shaphan, Abdon the son of Micah, Shaphan the scribe, and Asaiah a servant of the king, saying,
21. "Go, inquire of the LORD for me, and for those who are left in Israel and Judah, concerning the words of the book that is found; for great is the wrath of the LORD that is poured out on us, because our fathers have not kept the word of the LORD, to do according to all that is written in this book."
22. So Hilkiah and those the king had appointed went to Huldah the prophetess, the wife of Shallum the son of Tokhath, the son of Hasrah, keeper of the wardrobe. (She dwelt in Jerusalem in the Second Quarter.) And they spoke to her to that effect.
23. Then she answered them, "Thus says the LORD God of Israel, 'Tell the man who sent you to Me,
24. Thus says the LORD: 'Behold, I will bring calamity on this place and on its inhabitants, all the curses that are written in the book which they have read before the king of Judah,
25. because they have forsaken Me and burned incense to other gods, that they might provoke Me to anger with all the works of their hands. Therefore My wrath will be poured out on this place, and not be quenched.' " '
26. "But as for the king of Judah, who sent you to inquire of the LORD, in this manner you shall speak to him, 'Thus says the LORD God of Israel: "Concerning the words which you have heard—
27. because your heart was tender, and you humbled yourself before God when you heard His words against this place and against its inhabitants, and you humbled yourself before Me, and you tore your clothes and wept before Me, I also have heard you," says the LORD.
28. Surely I will gather you to your fathers, and you shall be gathered to your grave in peace; and your eyes shall not see all the calamity which I will bring on this place and its inhabitants." ' " So they brought back word to the king.
29. Then the king sent and gathered all the elders of Judah and Jerusalem.
30. And the king went up to the house of the LORD, with all the men of Judah and the inhabitants of Jerusalem--the priests and the Levites, and all the people, great and small. And he read in their hearing all the words of the Book of the Covenant which had been found in the house of the LORD.
31. Then the king stood in his place and made a covenant before the LORD, to follow the LORD, and to keep His commandments and His testimonies and His statutes with all his heart and all his soul, to perform the words of the covenant that were written in this book.
32. And he made all who were present in Jerusalem and Benjamin take a stand. So the inhabitants of Jerusalem did according to the covenant of God, the God of their fathers.
33. Thus Josiah removed all the abominations from all the country that belonged to the children of Israel, and made all who were present in Israel diligently serve the LORD their God. All his days they did not depart from following the LORD God of their fathers.

2 Chronicles 35

1. Now Josiah kept a Passover to the LORD in Jerusalem, and they slaughtered the Passover lambs on the fourteenth day of the first month.
2. And he set the priests in their duties and encouraged them for the service of the house of the LORD.

Passover In Jerusalem (NT) John 2:13-17

13. Now the Passover of the Jews was at hand, and Jesus went up to Jerusalem.
14. And He found in the temple those who sold oxen and sheep and doves, and the moneychangers doing business.
15. When He had made a whip of cords, He drove them all out of the temple, with the sheep and the oxen, and poured out the changers' money and overturned the tables.
16. And He said to those who sold doves, "Take these things away! Do not make My Father's house a house of merchandise!"
17. Then His disciples remembered that it was written, "Zeal for Your house has eaten Me up."

The Passover (Pesach) dates are approaching:

Please also read Delayed Passover.