Exodus 23:19

19 The choicest of the first fruits of your ground you shall bring into the house of the Lord your God. You shall not boil a kid in its mother's milk

Exodus 23:19 In-Context

17 Three times in the year all your males shall appear before the Lord God.
18 You shall not offer the blood of my sacrifice with anything leavened, or let the fat of my festival remain until the morning.
19 The choicest of the first fruits of your ground you shall bring into the house of the Lord your God. You shall not boil a kid in its mother's milk
20 I am going to send an angel in front of you, to guard you on the way and to bring you to the place that I have prepared.
21 Be attentive to him and listen to his voice; do not rebel against him, for he will not pardon your transgression; for my name is in him
New Revised Standard Version Bible, copyright 1989, Division of Christian Education of the National Council of the Churches of Christ in the United States of America. Used by permission. All rights reserved.