Genesis 39:5

“And it came to pass from the time that he had made him overseer in his house, and over all that he had, etc.] How long he was in this office is not certain; there must be some time for the following observation; and during all the time he was in it, it was easily discerned, that the Lord blessed the Egyptian’s house for Joseph’s sake; that is, much more than before; everything under his hands succeeded before, but now much more abundantly; Potiphar’s family was blessed with health, his substance increased, he grew rich and wealthy, and abounded with all good things: and the blessing of the Lord was upon all that he had in the house, and in the field; his domestic affairs prospered, his…”

“the Lord blessed the Egyptian's house for Joseph's sake, &c.--It might be--it probably was--that a special, a miraculous blessing was poured out on a youth who so faithfully and zealously served God amid all the disadvantages of his place. But it may be useful to remark that such a blessing usually follows in the ordinary course of things; and the most worldly, unprincipled masters always admire and respect religion in a servant when they see that profession supported by conscientious principle and a consistent life. made him overseer in his house--We do not know in what capacity Joseph entered into the service of Potiphar; but the observant eye of his master soon discovered his superior…”

“- Joseph in Potiphar’s House According to our reckoning, Perez and Zerah were born when Judah was in his twenty-eighth year, and therefore, Joseph in his twenty-fourth. Here, then, we go back seven years to resume the story of Joseph. Genesis 39:1-6 Joseph fares well with his first master. “Potiphar.” This is a racapitulation of the narrative in Genesis 37:0: “The Lord;” the God of covenant is with Joseph. “In the house.” Joseph was a domestic servant. “And his master saw.” The prosperity that attended all Joseph’s doings was so striking as to show that the Lord was with him. “Set him over” - made him overseer of all that was in his house. “The Lord blessed the Mizrite’s house.” He blesses…”

“39:5 God began to bless Egypt through Joseph (see 22:18).”