Sunan Ibn Majah, Book 28, Hadith 3365 (In-Book) ⓘ
It was narrated from Ibn ‘Umar that the Messenger of Allah said: “I do not forbid it,” meaning mastigure.
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُصَفَّى، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ عَبْدِ اللَّهِ بْنِ دِينَارٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " لاَ أُحَرِّمُ " . يَعْنِي الضَّبَّ .
also referenced under: Hadith 3242 (Reference) & Volume 4, Book 28, Hadith 3242 (DarusSalam)