Genesis 21:27

27 Abraham took sheep and cattle
A covenant or treaty was regularly ratified by animal sacrifice (Gn 8:20-9:9; 15:9-17; Ex 24:8) and often involved an exchange of gifts (1Kg 15:19; Hs 12:1). The animals here could serve both purposes.
and gave them to Abimelech, and the two of them made a covenant. b
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