A similar tradition has been transmitted by A’ishah through a different chain of narrators.
Sunan Abi Dawud Book 13, Hadith 46
← Previous Hadith Khawlah was the wife of Aws ibn as-Samit; he was a man immensely given to sexual intercourse. When his desire for intercourse was intensified, he made his wife like his mother's back. So Allah, the Exalted, sent down Qur'anic verses relating to expiation for zihar.

Sunan Abi Dawud Book 13, Hadith 45 Next Hadith → A man made his wife like the back of his mother. He then had intercourse with her before he atoned for it. He came to the Prophet (ﷺ) and informed him of this matter. He asked (him): What moved you to the action you have committed? He replied: I saw the whiteness of her shins in moon light. He said: Keep away from her until you expiate for your deed.

Sunan Abi Dawud Book 13, Hadith 47