Leviticus 22:28

Overview - Leviticus 22
The priests in their uncleanness must abstain from the holy things.
How they shall be cleansed.
10 Who of the priest's house may eat of the holy things.
17 The sacrifices must be without blemish.
26 The age of the sacrifice.
29 The law of eating the sacrifice of thanksgiving.
Treasury of Scripture Knowledge

Leviticus 22:28  (King James Version)
And whether it be cow or ewe, ye shall not kill it and her young both in one day.

or, she goat. ye shall not kill it.
This law was certainly intended to inculcate mercy and tenderness of heart; and so the Jews have understood it.
Exodus 23:19 ; 34:26 Deuteronomy 14:21 ; Deuteronomy 22:6 Deuteronomy 22:7