1 Samuel 30:15
And David said to him, Canst thou bring me down to this company? And he said, Swear unto me by God, that thou wilt neither kill me, nor deliver me into the hands of my master, and I will bring thee down to this company.
Cross-reference
Deuteronomy 23:15 commands not to return an escaped slave to his master — exactly what David is asked to promise.
Deuteronomy 23:16 adds that the escaped slave must be allowed to live freely — reinforcing the protection David offers.
Joshua 2:12 has Rahab asking spies to swear by the LORD to spare her — mirrors the Egyptian's request for an oath here.
In Joshua 9:19, the leaders refuse to break their oath to the Gibeonites, mirroring David's need to keep his oath to the Egyptian.
Joshua 9:20 continues the same logic: they let the Gibeonites live to avoid wrath for breaking the oath — same principle as David's oath.
Ezekiel 17:16 condemns breaking an oath — the opposite of David's faithful promise to the Egyptian.
Ezekiel 17:19 declares God's judgment on those who despise an oath — contrasting with David's oath-keeping here.
Judges 1:24 shows spies promising kindness to a man who reveals the city entrance — directly parallel to David's deal with the Egyptian.
Genesis 21:23 involves Abraham swearing an oath of kindness to Abimelech — similar to David's oath to the Egyptian.