Numbers 9:9-12

9And Jehovah spake unto Moses, saying, 10Speak unto the children of Israel, saying, If any man of you or of your generations shall be unclean by reason of a dead body, or be on a journey afar off, yet he shall keep the passover unto Jehovah. 11In the second month on the fourteenth day at even they shall keep it; they shall eat it with unleavened bread and bitter herbs: 12they shall leave none of it unto the morning, nor break a bone thereof: according to all the statute of the passover they shall keep it.