Leviticus 23:6

“And on the fifteenth day of the same month [is] the feast of unleavened bread unto the Lord, etc.] Which was the day the children of Israel went out of Egypt with their dough and leaven, having not time to leaven it; in remembrance of which this feast was appointed: seven days ye must eat unleavened bread; (see <021215>Exodus 12:15,18-20).”

“In these verses, the Passover, or Paschal Supper, and the Feast of Unleavened Bread, are plainly spoken of as distinct feasts. See Exodus 12:6, Exodus 12:15, Exodus 12:17; Numbers 28:16-17. Leviticus 23:5 See Exodus 12:6. According to the Hebrew mode of reckoning, the 15th day of the month began on the evening of the 14th. The day of holy convocation with which the Feast of Unleavened Bread commenced Leviticus 23:7 was the 15th, and that with which it terminated was the 21st. Compare Numbers 28:16-17. Leviticus 23:6 Feast - The three festivals (often called the Great Festivals), Passover, Pentecost and tabernacles, to which the name חג chag, i. e. a feast or rejoicing properly belongs…”

“23:6 Following Passover was the Festival of Unleavened Bread, during which Israel ate bread made without yeast (see study note on 2:11) to remember the Egyptian slavery that it represented and the haste with which they departed Egypt (Deut 16:3).”

“Exo 12:15, Exo 12:16, Exo 13:6, Exo 13:7, Exo 34:18; Num 28:17, Num 28:18; Deu 16:8; Act 12:3, Act 12:4 Leviticus 23:7”