Numbers 9:10-11

Amplified Bible

¹⁰ “Say to the Israelites, ‘If any one of you or of your descendants becomes [ceremonially] unclean because of [touching] a dead body or is on a distant journey, he may, however, observe the Passover to the Lord. ¹¹ On the fourteenth day of the second month [thirty days later] at twilight, they shall observe it; they shall eat it with unleavened bread and bitter herbs.