Exodus 12:2 - Albert Barnes' Notes on the Bible

This month - Abib Exodus 13:4. It was called “Nisan” by the later Hebrews, and nearly corresponds to our April. The Israelites are directed to take Abib henceforth as the beginning of the year; the year previously began with the month Tisri, when the harvest was gathered in; see Exodus 23:16. The injunction touching Abib or Nisan referred only to religious rites; in other affairs they retained the old arrangement, even in the beginning of the Sabbatic year; see Leviticus 25:9.