Numbers 9:10-12

“Tell the Israelites: ‘When any of you or your descendants are unclean because of a dead body or are away on a journey, they are still to celebrate the LORD’s Passover, but they are to do it on the fourteenth day of the second month at twilight. They are to eat the lamb, together with unleavened bread and bitter herbs. They must not leave any of it till morning or break any of its bones. When they celebrate the Passover, they must follow all the regulations.