Thematic Bible: Special passover, for those who were unclean, or on a journey, to be held in the second month

And there were certain men, who were defiled by the dead body of a man, that they could not keep the passover on that day: and they came before Moses and before Aaron on that day: And those men said unto him, We are defiled by the dead body of a man: why are we kept back, that we may not offer an offering of the LORD in its appointed time among the children of Israel? And Moses said unto them, Stand still, and I will hear what the LORD will command concerning you. read more.
And the LORD spoke unto Moses, saying, Speak unto the children of Israel, saying, If any man of you or of your descendants shall be unclean by reason of a dead body, or be in a journey afar off, yet he shall keep the passover unto the LORD. The fourteenth day of the second month at evening they shall keep it, and eat it with unleavened bread and bitter herbs. They shall leave none of it until the morning, nor break any bone of it: according to all the ordinances of the passover they shall keep it.

For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month. For they could not keep it at that time, because the priests had not sanctified themselves sufficiently, neither had the people gathered themselves together to Jerusalem. And the thing pleased the king and all the congregation.