So he let him go: then she said, A bloody husband thou art, because of the circumcision.
Moses neglected to circumcise his son, likely because he was too fond of his Midianite wife and too indulgent of her will, and so God met him in anger to kill him. Omissions are sins; the neglect of the covenant's seals shows we undervalue the promises and despise the conditions. Even good men grow slack in duty when cut off from the company of the faithful.
AI summary
Commenting on Exodus 4:24-31
Aaron met Moses at Horeb after the Lord commanded him to go into the wilderness; he kissed his brother, whom he had not seen in years, both as kinsman and as fellow in the work of deliverance. The swiftness of Aaron's arrival despite the distance shows either he delayed his departure or was held up at an inn, yet reached the mount of God in time to meet Moses.
AI summary
So he let him go--Moses recovered; but the remembrance of this critical period in his life would stimulate the Hebrew legislator to enforce a faithful attention to the rite of circumcision when it was established as a divine ordinance in Israel, and made their peculiar distinction as a people.