Passover: Special Passover, for Those Who Were Unclean, or on a Journey, to be Held in the Second Month
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Numbers 9:6–12
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 30:2–4
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. / This proposal pleased the king and the whole assembly.