In which verse is Adon used for Abraham and Sarah as husband and wife?

The word Adon is used for Abraham and Sarah as husband and wife in Genesis 18:12. In that verse Sarah laughs within herself after the Lord tells her she will have a child, and the same term for master or husband appears in the husband-wife relationship.

Les explains that the same word for master comes down from the human master-servant level into the social fabric of husband and wife. He points to Genesis 18, where the same word, Adon, is used with regard to Abraham and Sarah as husband and wife, specifically in verse 12. This occurs when the Lord told Sarah she was going to have a child, and Sarah laughed within herself, saying, "After I am waxed old, shall I have pleasure?" Earlier, in Genesis 24:9, the servant put his hand under the thigh of Abraham his master, showing the master and servant relationship in the human realm.

Genesis 18:12

Therefore Sarah laughed within herself, saying, After I am waxed old shall I have pleasure, my lord being old also?

Where in Genesis is the word Adon used for a husband in relation to his wife?

The word Adon is used for a husband in relation to his wife in Genesis 18:12, in the account of Abraham and Sarah. The context explains that this same term can apply to the husband-wife relationship, demonstrating how the thread of master runs through the social fabric, though not as slavery.