It was narrated that Ibn ‘Abbas said:
“I heard the Messenger of Allah ﷺ 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 ﷺ يَقُولُ " أَيُّمَا إِهَابٍ دُبِغَ فَقَدْ طَهُرَ " .