Why did God try to kill Moses in Exodus 4:24?

It is one of the most startling verses in the Torah. God has just commissioned Moses — given him signs, answered every objection, and sent him back to Egypt. And then, at a lodging on the road, "YHWH met him and sought to kill him" (Exodus 4:24).

The text gives no explanation. But the explanation is one chapter earlier, and Zipporah's response in the very next verse supplies it: she circumcises their son. Moses had a son who had not received the covenant sign.

The law making this a death-level matter is Genesis 17:14: "Any uncircumcised male who is not circumcised in the flesh of his foreskin, that soul shall be cut off from his people; he has broken my covenant." The Hebrew verb for "cut off" is כָּרַת (karat, H3772). It is not a mild word. It is the verb of covenant penalty — the same root used when God "cuts" a covenant, now turned against the person who has broken one. An uncircumcised son in a covenant household was not a private spiritual failure; it was a stated covenant-breach carrying a specified consequence.

Moses was not just any Israelite in this moment. He had been commissioned as the covenant-mediator who would go before Pharaoh and demand: "Let my son — Israel, my firstborn — go, so that he may serve me" (Exodus 4:23). A mediator demanding covenant faithfulness from Egypt while his own household stood in covenant-breach had no standing to make that demand. The attack was not arbitrary; it was the activation of a law Moses already lived under.

His wife Zipporah understood this without being told. She grabbed a flint, cut her son's foreskin, touched Moses with it, and the threat ended (Exodus 4:25-26). Zipporah used the verb כָּרַת — the penalty-root of Genesis 17:14 — to perform the act that satisfied the penalty. Blood covered the breach, and YHWH released Moses.

"At a lodging place on the way, YHWH met him and sought to kill him. Then Zipporah took a flint and cut off her son's foreskin and touched his feet with it." — Exodus 4:24–25

One textual note matters here. The Masoretic Hebrew reads plainly that YHWH sought to kill Moses. An ancient Greek translation softens this to "an angel of the Lord." A pseudepigraphal retelling (the book of Jubilees, outside the canon) calls the attacker "prince Mastema," an adversarial angel. A Dead Sea Scroll — a pre-Christ Hebrew manuscript roughly a thousand years older than the main surviving Hebrew codices — preserves the passage without the softening, confirming the Masoretic reading. The harder text is the older text: YHWH himself is the threat, and the circumcision-blood is what averts him.

The scene is structurally placed. It sits immediately after the declaration "Israel is my firstborn" (4:22-23) and immediately before Moses arrives in Egypt (4:27-31). Before the deliverer can lead the firstborn-nation out of Egypt, the covenant-sign must be right in his own house. The story will not let the inconsistency stand.

The full study on Exodus 4 shows how this scene connects to the Passover — the same logic of blood averting a death-threat, widened from one family to the whole nation.