Fausset's Bible Dictionary
The month Νisan . ("ears of grain", namely, barley (Exodus 13:4).) (See .) On the 15th day of Nisan, the Jews began harvest by gathering a sheaf of barley firstfruits, and on the 16th day of Nisan, offered it (Leviticus 23:4-14). On the 10th day of Nisan, the Passover lamb was taken, on the 14th day of Nisan, slain and eaten.
These files are public domain.
Fausset, Andrew R. Entry for 'Abib'. Fausset's Bible Dictionary. https://www.studylight.org/dictionaries/eng/fbd/a/abib.html. 1949.