Genesis 24:2

24:2 Abraham said to his servant, the senior one ¹  in his household who was in charge of everything he had, “Put your hand under my thigh ² 

Genesis 24:9

24:9 So the servant placed his hand under the thigh of his master Abraham and gave his solemn promise he would carry out his wishes. ³ 

¹ tn The Hebrew term זָקֵן (zaqen) may refer to the servant who is oldest in age or senior in authority (or both).

² sn Put your hand under my thigh. The taking of this oath had to do with the sanctity of the family and the continuation of the family line. See D. R. Freedman, “Put Your Hand Under My Thigh – the Patriarchal Oath,” BAR 2 (1976): 2-4, 42.

³ tn Heb “and he swore to him concerning this matter.”