Exodus 12:43

‘Now you shall eat it in this manner: with your loins girded, your sandals on your feet, and your staff in your hand; and you shall eat it in haste—it is the Passover of Yahweh.

Then a man of God came to Eli and said to him, “Thus says Yahweh, ‘Did I not indeed reveal Myself to the house of your father when they were in Egypt, enslaved to Pharaoh’s house?

For a multitude of the people, even many from Ephraim and Manasseh, Issachar, and Zebulun, had not cleansed themselves, yet they ate the Passover otherwise than what was written. For Hezekiah prayed for them, saying, “May Yahweh, who is good, atone

when you brought in foreigners, uncircumcised in heart and uncircumcised in flesh, to be in My sanctuary to profane it, even My house, when you brought near My food, the fat and the blood. So they made My covenant void—this in addition to all your abominations.

By faith he kept the Passover and the sprinkling of the blood, so that he who destroyed the firstborn would not touch them.

The Statute of the Passover