Genesis 18:14

18:14 Is anything impossible ¹  for the Lord? I will return to you when the season comes round again and Sarah will have a son.” ² 

Genesis 42:15

42:15 You will be tested in this way: As surely as Pharaoh lives, ³  you will not depart from this place unless your youngest brother comes here.

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¹ tn The Hebrew verb פָּלָא (pala’) means “to be wonderful, to be extraordinary, to be surpassing, to be amazing.”

² sn Sarah will have a son. The passage brings God’s promise into clear focus. As long as it was a promise for the future, it really could be believed without much involvement. But now, when it seemed so impossible from the human standpoint, when the Lord fixed an exact date for the birth of the child, the promise became rather overwhelming to Abraham and Sarah. But then this was the Lord of creation, the one they had come to trust. The point of these narratives is that the creation of Abraham’s offspring, which eventually became Israel, is no less a miraculous work of creation than the creation of the world itself.

³ tn Heb “[By] the life of Pharaoh.”

sn As surely as Pharaoh lives. Joseph uses an oath formula to let the brothers know the certainty of what he said. There is some discussion in the commentaries on swearing by the life of Pharaoh, but since the formulation here reflects the Hebrew practice, it would be hard to connect the ideas exactly to Egyptian practices. Joseph did this to make the point in a way that his Hebrew brothers would understand. See M. R. Lehmann, “Biblical Oaths,” ZAW 81 (1969): 74-92.