6 On the fifteenth day of the same month is the feast of unleavened bread to Yahweh. Seven days you shall eat unleavened bread.
*Minor differences ignored. Grouped by changes, with first version listed as example.
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 Leviticus 23:6, Leviticus 23:34, Leviticus 23:39, Leviticus 23:41, were distinguished by the attendance of the male Israelites at the national sanctuary (compare Exodus 23:17; Exodus 34:23; Deuteronomy 16:16). In later times they were called by the rabbins "pilgrimage feasts." It is worthy of note that the Hebrew word is identical with the Arabic "haj", the name of the pilgrimage to Mecca, from which comes the well-known word for a pilgrim, "haji".
And on the fifteenth day of the same month is the feast of unleavened bread unto the Lord,.... 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 Exodus 12:15.
*More commentary available at chapter level.