swear.

Hebrews 6:13
When God made His promise to Abraham, since He had no one greater to swear by, He swore by Himself,

Genesis 14:22
But Abram replied to the king of Sodom, "I have raised my hand to the LORD God Most High, Creator of heaven and earth,

Genesis 21:23
Now, therefore, swear to me here before God that you will not deal falsely with me or my children or descendants. Show to me and to the country in which you reside the same kindness that I have shown to you."

Matthew 23:20-22
So then, he who swears by the altar swears by it and by everything on it. . . .

an oath.

Genesis 21:30, 31
He replied, "You are to accept the seven ewe lambs from my hand as my witness that I dug this well." . . .

Genesis 31:53
May the God of Abraham and the God of Nahor, the God of their father, judge between us." So Jacob swore by the One feared by his father Isaac.

Exodus 22:11
an oath before the LORD shall be made between the parties to determine whether or not the man has taken his neighbor's property. The owner must accept the oath and require no restitution.

Joshua 9:15-20
And Joshua made a treaty of peace with them to let them live, and the leaders of the congregation swore an oath to them. . . .

2 Samuel 21:2
At this, David summoned the Gibeonites and spoke to them. (Now the Gibeonites were not Israelites, but a remnant of the Amorites. The Israelites had taken an oath concerning them, but in his zeal for Israel and Judah, Saul had sought to kill them.)

Ezekiel 17:16-20
As surely as I live, ' declares the Lord GOD, 'surely he will die in Babylon, in the land of the king who enthroned him, whose oath he despised and whose covenant he broke. . . .