The Feast of the Passover: Might be Kept in the Second Month by Those Who Were Unclean

But there were some men who were unclean due to a dead body, so they could not observe the Passover on that day. And they came before Moses and Aaron that same day …

For the king and his officials and the whole assembly in Jerusalem had decided to keep the Passover in the second month,

…since they had been unable to keep it at the regular time, because not enough priests had consecrated themselves and the people had not been gathered in Jerusalem.

And on the fourteenth day of the second month they slaughtered the Passover lamb. The priests and Levites were ashamed, and they consecrated themselves and brought burnt offerings to the house of the LORD.