Genesis 24:2-9

2Abraham said to his servant, the oldest of his household who was in 1charge of all that he owned, “2Please place your hand under my thigh, 3and I will make you swear by the Lord, 3the God of heaven and the God of earth, that you 4shall not take a wife for my son from the daughters of 5the Canaanites, among whom I live; 4but you will go to 6my country and to my relatives, and take a wife for my son Isaac.” 5The servant said to him, “Suppose the woman is not willing to follow me to this land; should I take your son back to the land from where you came?” 6Then Abraham said to him, “7Beware that you do not take my son back there! 78The Lord, the God of heaven, who took me from my father’s house and from the land of my birth, and who spoke to me and who swore to me, saying, ‘9To your 10descendants I will give this land’--He will send 11His angel ahead of you, and you will take a wife for my son from there. 8But if the woman is not willing to follow you, then you will 12be free of this oath of mine; 13only do not take my son back there.” 9So the servant 14placed his hand under the thigh of his master Abraham, and swore to him concerning this matter.