Leviticus 23:5

‘And you shall keep it until the fourteenth day of the same month, then the whole assembly of the congregation of Israel shall slaughter it at twilight.

‘Now this day will be a memorial to you, and you shall celebrate it as a feast to Yahweh; throughout your generations you are to celebrate it as a perpetual statute.

‘In the first month, on the fourteenth day of the month at evening, you shall eat unleavened bread until the twenty-first day of the month at evening.

“Now, let the sons of Israel observe the Passover at its appointed time.

then make an offering by fire to Yahweh, a burnt offering or a sacrifice to fulfill a special vow, or as a freewill offering or in your appointed times, to make a soothing aroma to Yahweh, from the herd or from the flock.

‘Then on the fourteenth day of the first month shall be the Passover of Yahweh.

“And it shall be the prince’s part to provide the burnt offerings, the grain offerings, and the drink offerings, at the feasts, on the new moons, and on the sabbaths, at all the appointed times of the house of Israel; he shall provide the sin offering, the grain offering, the burnt offering, and the peace offerings, to make atonement for the house of Israel.”

“In the first month, on the fourteenth day of the month, you shall have the Passover, a feast of seven days; unleavened bread shall be eaten.