Gen 24:2-9.   And Abraham said unto his eldest servant of his house, that ruled over all that he had, Put, I pray thee, thy hand under my thigh: And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell: But thou shalt go unto my country, and to my kindred, and take a wife unto my son Isaac. And the servant said unto him, Peradventure the woman will not be willing to follow me unto this land: must I needs bring thy son again unto the land from whence thou camest? And Abraham said unto him, Beware thou that thou bring not my son thither again. The LORD God of heaven, which took me from my father's house, and from the land of my kindred, and which spake unto me, and that sware unto me, saying, Unto thy seed will I give this land; he shall send his angel before thee, and thou shalt take a wife unto my son from thence. And if the woman will not be willing to follow thee, then thou shalt be clear from this my oath: only bring not my son thither again. And the servant put his hand under the thigh of Abraham his master, and sware to him concerning that matter. Neh 5:12-13.   Then said they, We will restore them, and will require nothing of them; so will we do as thou sayest. Then I called the priests, and took an oath of them, that they should do according to this promise. Also I shook my lap, and said, So God shake out every man from his house, and from his labour, that performeth not this promise, even thus be he shaken out, and emptied. And all the congregation said, Amen, and praised the LORD. And the people did according to this promise. Eccl 5:2,5.   Be not rash with thy mouth, and let not thine heart be hasty to utter any thing before God: for God is in heaven, and thou upon earth: therefore let thy words be few. ...Better is it that thou shouldest not vow, than that thou shouldest vow and not pay.