covenant
US /ˈkʌv.ən.ənt/
UK /ˈkʌv.ən.ənt/

1.
2.
(in biblical contexts) an agreement between God and his people, in which God makes promises to his people and, in return, expects faithfulness from them
:
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The Old Testament describes God's covenant with Abraham.
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The rainbow is a sign of God's covenant with Noah.