Exodus 23:18-20
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18 Thou shalt not offer the blood of my sacrifice with leavened bread; neither shall the fat of my sacrifice remain until the morning.
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19 The first of the firstfruits of thy land thou shalt bring into the house of the LORD thy God. Thou shalt not seethe a kid in his mother's milk.
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20 Behold, I send an Angel before thee, to keep thee in the way, and to bring thee into the place which I have prepared.