Sunan Abi Dawud, Hadith 2222 ⓘ
Ibn ‘Umar said “The waiting period of a woman who separates herself from her husband for compensation is a menstrual period.”
حَدَّثَنَا الْقَعْنَبِيُّ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ عِدَّةُ الْمُخْتَلِعَةِ حَيْضَةٌ .
also referenced under: Hadith 2230 (DarusSalam)