Genesis 24:2,9
And Abraham said to his oldest servant of his house, that ruled over all that he had, Put, I pray you, your hand under my thigh:
Torrey's Topical Textbook—AKJV

Genesis 47:29
And the time drew near that Israel must die: and he called his son Joseph, and said to him, If now I have found grace in your sight, put, I pray you, your hand under my thigh, and deal kindly and truly with me; bury me not, I pray you, in Egypt:
Torrey's Topical Textbook—AKJV