2 Samuel 14:11
Then said she, I pray thee, let the king remember the Lord thy God, that thou wouldest not suffer the revengers of blood to destroy any more, lest they destroy my son. And he said, As the Lord liveth, there shall not one hair of thy son fall to the earth.
Cross-reference
Numbers 35:19 defines the avenger of blood — the legal basis for the threat the woman seeks to avoid in this plea.
Numbers 35:27 specifies when the avenger may kill (outside refuge) — the precise danger the woman fears for her son.
Deuteronomy 19:4-10 establishes cities of refuge for accidental killers — the system underlying the woman's request for protection.
Joshua 20:3-6 describes cities of refuge where a manslayer flees the avenger — the mechanism the woman's son needs.
1 Kings 1:52 has Solomon's conditional promise 'not one hair shall fall' — same idiom for sparing life, but with a condition.
Acts 27:34 has Paul's promise 'not a hair from your head will be lost' — same idiom of complete safety in peril.
Luke 12:7 says hairs are numbered—directly echoes David's assurance that not one hair shall fall, showing divine protection.
Luke 21:18 promises not a hair will perish—nearly identical wording to David's oath, reinforcing God's protective care.