‘Ikrimah said “A man made his wife like the back of his mother. When he saw the illumination of her shin in the moonlight, he had intercourse with her. He came to the Prophet (ﷺ). He ordered him to atone for it.
Sunan Abi Dawud Book 13, Hadith 48
← Previous 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 Next Hadith → A similar tradition has been transmitted by Ibn ‘Abbas from the Prophet (ﷺ) through a different chain of narrators. This version does not mention the word “shin”.

Sunan Abi Dawud Book 13, Hadith 49