Exodus Chapter 4, Verse 26
From BibleWiki
26: So he let him go: then she said, A bloody husband thou art,
because of the circumcision.
26: and he departed from him, because she said, The blood of the circumcision of my son is staunched.
This hostile attitude on the part of God was occasioned by his neglect to circumcise his son; for, as soon as Zipporah cut off (circumcised) the foreskin of her son with a stone, Jehovah let him go.
Moses was apparently induced by what had occurred to decide not to take his wife and children with him to Egypt, but to send them back to his father-in-law. We may infer this from the fact, that it was not till after Israel had arrived at Sinai that he brought them to him again (Ex 18:2).
