Being faithful in your relationships (Genesis 39)

Genesis 39:8-9

But he refused and said to his master's wife, "Look, with me here, my master has no concern about anything in the house, and he has put everything that he has in my hand. He is not greater in this house than I am, nor has he kept back anything from me except yourself, because you are his wife. How then could I do this great wickedness and sin against God?" (NRSVue)

Potiphar explicitly put his wife off limits to Joseph. Otherwise, Potiphar's wife may have had the power to give this order. Joseph's intention to avoid Potiphar's wife was connected with the covenantal relationships he had with Potiphar and with God. As John Goldingay says,

First, there is a relationship of trust between him and his master, which he cannot betray. Second, having sex with Potiphar's wife would be something very bad; it is a common evaluation of adultery in the Middle East. And third, it would involve doing wrong against God or offending God or falling short of God's expectations. ("Genesis," Baker Commentary on the Old Testament Pentateuch, 2020)

Relationships are important and it is important that we be totally faithful to our relationship partners.

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Genesis 39:3-4

His master saw that the LORD was with him and that the LORD caused all that he did to prosper in his hands. So Joseph found favor in his sight and attended him; he made him overseer of his house and put him in charge of all that he had.

What did Potiphar see?
How does God's presence make things happen?

Here are some thoughts from Teranct Fretheim ("Genesis," NIBC, Abingdon, OliveTree e-book).

It probably presupposes that Joseph’s presence “in the house of his Egyptian master” entails theological conversation, or at least sufficient knowledge of Joseph to make the connection between his God and his words and deeds.
There are implications here for how God works in the world: not in overwhelming power, but in and through the ambiguities and complexities of the relationships of integrity God has established.
God also works with Potiphar, so that Joseph finds favor in his eyes. Thus God appears active, not only within the lives of the family of promise, but also within those who do not confess the name of God.