Matthew Henry on Genesis 42:7-20
We may well wonder that Joseph, during the twenty years that he had now been in Egypt, especially during the last seven years that he had been in power there, never sent to his father to acquaint him with his circumstances; nay, it is strange that he who so often went throughout all the land of Egypt (Gen 41:45, Gen 41:46) never made an excursion to Canaan, to visit his aged father, when he was in the borders of Egypt, that lay next to Canaan. Perhaps it would not have been above three or four days' journey for him in his chariot. It is a probable conjecture that his whole management of himself in this affair was by special direction from Heaven, that the purpose of God concerning Jacob and…
Read the whole note in the consoleJamieson-Fausset-Brown on Genesis 42:17
put them . . . into ward three days--Their confinement had been designed to bring them to salutary reflection. And this object was attained, for they looked upon the retributive justice of God as now pursuing them in that foreign land. The drift of their conversation is one of the most striking instances on record of the power of conscience [Gen 42:21-22].
Adam Clarke on Genesis 42:15
By the life of Pharaoh - חי פרעה chey Pharaoh, Pharaoh liveth. As if he had said, As surely as the king of Egypt lives, so surely shall ye not go hence unless your brother come hither. Here therefore is no oath; it is just what they themselves make it in their report to their father, Gen 43:3 : the man did solemnly protest unto us; and our translators should not have put it in the form of an oath, especially as the original not only will bear another version, but is absolutely repugnant to this in our sense of the word.
John Gill on Genesis 42:17
And he put them all together into ward three days. In order to consult together, and agree who should be sent to fetch their brother; and which it seems probable in this length of time they could not agree upon, no one caring to be the bringer of such evil tidings to their father.