('em, ordinary Hebrew word for "mother"):
Hebrew law prohibited the destruction of the "dam" and the young of birds at the same time, commanding that if the young be taken from a nest the dam be allowed to escape (Deuteronomy 22:6,7). In the same spirit it enjoined the taking of an animal for slaughter before it had been seven days with its "dam" (Exodus 22:30; Leviticus 22:27; compare Exodus 23:19).
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Orr, James, M.A., D.D. General Editor. "Entry for 'DAM'". "International Standard Bible Encyclopedia". <http://classic.studylight.org/enc/isb/view.cgi?number=T2507>. 1915.