Numbers 9:11-12

11They must eat it during the evening of the 14th day of the second month. They must eat it when it starts to become dark. They must eat it with bread and with bitter herbs. The bread must not have yeast in it.

12They must not keep any of the food until the next morning. And they must not break any of the bones of the lamb. And they must obey all the rules about the Passover.