'Keep the Passover' in the Bible

Let the children of Israel keep the Passover at its regular time.

And Moses gave orders to the children of Israel to keep the Passover.

And there were certain men who were unclean because of a dead body, so that they were not able to keep the Passover on that day; and they came before Moses and before Aaron on that day:

Say to the children of Israel, If any one of you or of your families is unclean because of a dead body, or is on a journey far away, still he is to keep the Passover to the Lord:

But the man who, not being unclean or on a journey, does not keep the Passover, will be cut off from his people: because he did not make the offering of the Lord at the regular time, his sin will be on him.

And if a man from another country is among you and has a desire to keep the Passover to the Lord, let him do as is ordered in the law of the Passover: there is to be the same rule for the man from another nation and for him who had his birth in the land.