On the fifteenth day of this month, there shall be a feast; for seven days unleavened bread is to be eaten.
On the fifteenth day, a seven-day feast begins during which unleavened bread is eaten. Passover opens into a full week of observance.
It connects Passover to the longer Feast of Unleavened Bread.
16The fourteenth day of the first month is the LORD’s Passover. 17On the fifteenth day of this month, there shall be a feast; for seven days unleavened bread is to be eaten. 18On the first day there is to be a sacred assembly; you must not do any regular work. 19Present to the LORD a food offering, a burnt offering of two young bulls, one ram, and seven male lambs a year old, all unblemished. 20The grain offering shall consist of fine flour mixed with oil; offer three-tenths of an ephah with each bull, two-tenths of an ephah with the ram, 21and a tenth of an ephah with each of the seven lambs. 22Include one male goat as a sin offering to make atonement for you. 23You are to present these in addition to the regular morning burnt offering. 24Offer the same food each day for seven days as a food offering, a pleasing aroma to the LORD. It is to be offered with its drink offering and the regular burnt offering. 25On the seventh day you shall hold a sacred assembly; you must not do any regular work.