Exodus 13:12

12 you should set aside for the LORD whatever comes out of the womb first. All of the first males born to your animal belong to the LORD.

Exodus 13:12 In-Context

10 So you should follow this regulation at its appointed time every year.
11 "When the LORD brings you into the land of the Canaanites and gives it to you as promised to you and your ancestors,
12 you should set aside for the LORD whatever comes out of the womb first. All of the first males born to your animal belong to the LORD.
13 But every first male donkey you should ransom with a sheep. If you don't ransom it, you must break its neck. You should ransom every oldest male among your children.
14 When in the future your child asks you, ‘What does this mean?' you should answer, ‘The LORD brought us with great power out of Egypt, out of the place we were slaves.
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