Ellicott's Commentary for English Readers - Genesis 42:15
(15) By the life of Pharaoh.—It was common in ancient times to swear by the king’s life (see 1 Samuel 17:55; 2 Samuel 14:19 ), and even by the life of Jehovah (2 Samuel 15:21; 2 Kings 2:2; 2 Kings 2:4; 2 Kings 2:6). It is only in the stricter morality of the Gospel that such oaths are forbidden (Matthew 5:33-37). read more
Ellicott's Commentary for English Readers - Genesis 42:14
(14) That is it . . . —Joseph persists in his charge, because, besides the information which he gained, he also wished to get Benjamin into his power, that he might have him with him. As for his brethren, he had probably as yet no settled purpose, but naturally he would feel great indignation at the treatment he had experienced at their hands, and might not be unwilling to give them some degree of punishment. read more