Genesis 24:2-3, Genesis 24:5-6, Genesis 24:8-9

²And Abraham said to his servant, the oldest of his household, who ^aruled over all that he owned, “^bPlease place your hand under my thigh, ³and I will make you swear by Yahweh, ^athe God of heaven and the God of earth, that you ^bshall not take a wife for my son from the daughters of ^cthe Canaanites, among whom I live,

⁵And the servant said to him, “Suppose the woman is not willing to follow me to this land; should I indeed take your son back to the land from where you came?” ⁶Then Abraham said to him, “^aBeware lest you take my son back there!

⁸“But if the woman is not willing to follow you, then you will ^abe free from this oath of mine; ^bonly do not take my son back there.” ⁹So the servant ^aplaced his hand under the thigh of Abraham his master and swore to him concerning this matter.