God was angry at Moses and going to kill him until Moses' wife did what?

ANSWER

Circumcised her son.

Exodus 4 :

(24) At a lodging place on the way, the LORD met Moses and was about to kill him. (25) But Zipporah took a flint knife, cut off her son’s foreskin and touched Moses’ feet with it. “Surely you are a bridegroom of blood to me,” she said. (26) So the LORD let him alone. (At that time she said “bridegroom of blood,” referring to circumcision.)
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