John Gill Commentary Genesis 39:16

"And she laid up his garment by her, until his master came home." — Genesis 39:16 (ASV)

And she laid up his garment by her
As a proof of what she laid to his charge, and as a testimony against him: until her lord came home ;
or until his lord came home, for the pronoun refers to Joseph, and so Jarchi interprets it; who either was gone a journey, or gone to court that day, being an officer of Pharaoh's, or to the public place where the festival was kept that day, if it was such an one.