Sunan Ibn Majah, Hadith 3609 ⓘ
It was narrated that Ibn ‘Abbas said: “I heard the Messenger of Allah say: ‘Any skin that has been tanned has been purified.’”
حَدَّثَنَا أَبُو بَكْرٍ، حَدَّثَنَا سُفْيَانُ بْنُ عُيَيْنَةَ، عَنْ زَيْدِ بْنِ أَسْلَمَ، عَنْ عَبْدِ الرَّحْمَنِ بْنِ وَعْلَةَ، عَنِ ابْنِ عَبَّاسٍ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ ـ صلى الله عليه وسلم ـ يَقُولُ " أَيُّمَا إِهَابٍ دُبِغَ فَقَدْ طَهُرَ " .
also referenced under: Book 32, Hadith 3740 (In-Book) & Volume 4, Book 32, Hadith 3609 (DarusSalam)