the captaine of the guard] This may well be thought to be the same Potiphar who before committed Joseph to prison; for by this time, (the Lord being with him and shewing him mercy, Chap. 39. 21.) his innocencie might be made known unto him by meanes of the keeper of the prison, to whom it is like he told the true story of his Mistresses false and foul dealing towards his Master, and himselfe, though for his owne credit sake he might desire to bury that unhonest businesse in perpetuall silence.