Hadith
حَدَّثَنَا الْقَعْنَبِيُّ، عَنْ مَالِكٍ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، قَالَ عِدَّةُ الْمُخْتَلِعَةِ حَيْضَةٌ .
Ibn ‘Umar said “The waiting period of a woman who separates herself from her husband for compensation is a menstrual period.”
Sahih · Al-Albani
Sunan Abi Dawud 2230 ·Book 13, Hadith 56·Also available on sunnah.com·