Leviticus 23:6
“And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord: seven days ye must eat unleavened bread.”
These are the feasts of the Lord, even holy convocations, which ye shall proclaim in their seasons.
In the fourteenth day of the first month at even is the Lord’s passover.
And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord: seven days ye must eat unleavened bread.
In the first day ye shall have an holy convocation: ye shall do no servile work therein.
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.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“Therefore let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.”
“The feast of unleavened bread shalt thou keep. Seven days thou shalt eat unleavened bread, as I commanded thee, in the time of the month Abib: for in the month Abib thou camest out from Egypt.”
“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.”
“And because he saw it pleased the Jews, he proceeded further to take Peter also. (Then were the days of unleavened bread.)”
“And in the fifteenth day of this month is the feast: seven days shall unleavened bread be eaten.”