Genesis 39:20

“And Joseph’s master took him, and put him into the prison, etc.] Which was in or adjoining to his house, (<014003>Genesis 40:3); of himself he had power to do this, as the captain of the guard; and as he was the chief of the executioners, as some take his office to be, it is much he did not in his passion deliver him up into their hands to put him to death at once; but it may be through the great respect he had had for Joseph, which was not wholly extinguished by this impeachment of him; and especially if he heard Joseph’s apology for himself before he committed him, his passion might subside a little, though for the credit of his wife he might take this step; or however things were so…”

“Joseph's master took him, and put him into the prison--the roundhouse, from the form of its construction, usually attached to the dwelling of such an officer as Potiphar. It was partly a subterranean dungeon (Gen 41:14), though the brick-built walls rose considerably above the surface of the ground, and were surmounted by a vaulted roof somewhat in the form of an inverted bowl. Into such a dungeon Potiphar, in the first ebullition of rage, threw Joseph and ordered him to be subjected further to as great harshness of treatment (Psa 105:18) as he dared; for the power of masters over their slaves was very properly restrained by law, and the murder of a slave was a capital crime. a place where…”

“- 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…”