No leaven shall be seen with you in all your territory for seven days; nor shall any of the flesh which you sacrifice on the evening of the first day remain all night until morning.
Seven days you shall eat unleavened bread; on the first day you shall put away leaven out of your houses, for if any one eats what is leavened, from the first day until the seventh day, that person shall be cut off from Israel.
and you shall keep it until the fourteenth day of this month, when the whole assembly of the congregation of Israel shall kill their lambs in the evening.