The Feast of the Passover: Might be Kept in the Second Month by Those Who Were Unclean
Source: TTT
Numbers 9:6–11
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 / and said to Moses, “We are unclean because of a dead body, but why should we be excluded from presenting the LORD’s offering with the other Israelites at the appointed time?” / “Wait here until I find out what the LORD commands concerning you,” Moses replied.
2 Chronicles 30:2, 3, 15
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 observe 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.