The 1901 Jewish Encyclopedia
Name of the first month of the Hebrew year (Exodus 12:2; compare 13:4), corresponding to the Babylonian and postexilian Hebrew Nisan. According to the Babylonian system, which probably prevailed in Palestine, it began in ordinary years in the last third of March, but in every third or intercalary year a month later (see CALENDAR).
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Singer, Isidore, Ph.D, Projector and Managing Editor. Entry for 'Abib'. 1901 The Jewish Encyclopedia. https://www.studylight.org/encyclopedias/eng/tje/a/abib.html. 1901.