TSK · Exodus 13:6

Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.

But ye shall offer an offering made by fire unto the LORD seven days: in the seventh day [is] an holy convocation: ye shall do no servile work [therein].