The Pulpit Commentary - Genesis 39:3
And his master saw that the Lord (Jehovah) was with him —this does not imply that Potiphar was acquainted with Jehovah, but simply that he concluded Joseph to be under the Divine protection— and that the Lord (Jehovah) made all that he did to prosper in his hand. That which led to the conviction of Potiphar concerning Joseph was the remarkable success which he saw attending all his efforts and undertakings. read more
The Pulpit Commentary - Genesis 39:2
And the Lord —Jehovah, as usual, because the entire chapter is the work of the Jehovist (Tuch, Colenso), with the exception of a few alterations by the redactor (Davidson), or because, though the work of the Elohist, it has been modified by the Jehovistic editor (Bleek, Vaihinger); but more likely because the advancement of Joseph in Egypt was a special fruit of the theocratic promise which belonged to the patriarchal family (Hengstenberg, Quarry)— was with Joseph (cf. Genesis 39:21 ; ... read more