Commentaries:
Jamieson, Fausset, and Brown
it shall be seven days under the dam—Animals were not considered perfect nor good for food till the eighth day. As sacrifices are called the bread or food of God (Leviticus 22:25), to offer them immediately after birth, when they were unfit to be eaten, would have indicated a contempt of religion; and besides, this prohibition, as well as that contained in Leviticus 22:28, inculcated a lesson of humanity or tenderness to the dam, as well as secured the sacrifices from all appearance of unfeeling cruelty.
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