"Seven days shall it be with its mother': What is the intent of this? Because it is written (Leviticus 22:27) "then it shall stay seven days under its mother" — with its mother (i.e., while its mother is living). But perhaps, "under," literally, (i.e., instead of its mother, [when its mother has died]). It is, therefore, written (here) "Seven days shall it be with its mother." Just as here, with its mother, so, there, with its mother.