"We are attacking the Maghrib, and they are people who worship idols, and they have waterskins in which they keep milk and water." Ibn 'Abbas said: "Tanning is purification." Ibn Wa'lah said: "Is this your own opinion, or something that you heard from the Messenger of Allah?" He said: "No, (I heard it) from the Messneger of Allah." (Using translation from Nasāʾī 4242)
إِنَّا نَغْزُو هَذَا الْمَغْرِبَ وَإِنَّهُمْ أَهْلُ وَثَنٍ وَلَهُمْ قِرَبٌ يَكُونُ فِيهَا اللَّبَنُ وَالْمَاءُ فَقَالَ ابْنُ عَبَّاسٍ «الدِّبَاغُ طَهُورٌ» فَقَالَ ابْنُ وَعْلَةَ عَنْ رَأْيِكَ أَوْ عَنْ شَيْءٍ سَمِعْتَهُ مِنْ رَسُولِ اللهِ ﷺ؟ قَالَ بَلْ عَنْ رَسُولِ اللهِ ﷺ