Sunan Abi Dawud 2221
سنن أبي داود#2221SahihNarrated Ikrimah: 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiHasan
In-book reference: 13:47