Hebrews 6:13 provides the immediate foundation: God swore by himself because no greater existed, directly supporting the oath principle here.

Hebrews 6:17 applies the general oath principle to God's guarantee to heirs of the promise, directly continuing the argument.

Hebrews 7:21 cites God's oath making Christ a priest forever, exemplifying the confirming oath described in 6:16.

Genesis 21:23 records Abimelech asking Abraham to swear by God, illustrating the practice of swearing by a greater authority.

Ezekiel 17:16-20 shows God's judgment on Zedekiah for despising his oath — reinforcing that oaths sworn by God are irrevocable.

Joshua 9:15-20 demonstrates the binding power of an oath sworn by God, even when made deceptively — confirming the oath's finality.

Exodus 22:11 shows an oath before the Lord used to settle a dispute — the very 'put an end to all argument' that Hebrews describes.

Genesis 31:53 has Jacob and Laban swearing by the God of their fathers, another instance of swearing by a greater being.

Genesis 14:22 shows Abraham swearing by the LORD, an OT example of swearing by someone greater as described here.

In Ruth 3:13, Boaz swears by the Lord to redeem Ruth—a direct example of the human oath practice described here.

In 1 Samuel 20:3, David swears by the Lord and by Jonathan's life—another instance of human oaths invoking a greater authority.

In 1 Samuel 24:21, Saul asks David to swear by the Lord—an example of oath-taking by invoking God as the greater authority.

In 1 Kings 18:15, Elijah swears by the Lord of hosts—another clear example of swearing by a greater authority.

In Isaiah 14:24, the Lord swears that His plan will stand—a divine oath contrasting with the human oaths here.

In Isaiah 54:9, God swears to not be angry again—another divine oath that parallels the oath theme.

In Luke 1:73, the oath God swore to Abraham is mentioned—the same divine oath that Hebrews contrasts with human oaths.

Matthew 23:20-22 explains that oaths by altar, temple, or heaven ultimately refer to God, paralleling the logic of swearing by someone greater.

Genesis 26:31 shows them eating and swearing an oath, then departing in peace — the oath ends the dispute.

In 2 Samuel 19:23, King David swears an oath to Shimei—a human oath similar to those described here.

Genesis 26:28 describes Abimelech and Isaac making a covenant with an oath — sealing their agreement.

Genesis 25:33 shows Jacob making Esau swear to sell his birthright — an oath used to make the transaction binding.

Genesis 24:3 has Abraham making his servant swear by the Lord — an oath by a greater to secure a crucial commitment.