That during the Year of the Conquest, while he was in Makkah, he heard the Messenger of Allah ﷺ saying: "Indeed Allah and His Messenger unlawful the sale of wine, dead carcasses, the pig, and idols." They said: "O Messenger of Allah! What about the fat of carcasses? For indeed it is used to coat the ships, skins are oiled with it, and people use it for lamps?" He said: "No. It is unlawful." Then, with that, the Messenger of Allah ﷺ said: "May Allah fight (curse) the Jews! Indeed Allah made the fat unlawful for them, they melted it, sold it, and consumed its price." [He said:] There are narrations of this topic from 'Umar and Ibn 'Abbas.  

أَنَّهُ سَمِعَ رَسُولَ اللَّهِ ﷺ عَامَ الْفَتْحِ وَهُوَ بِمَكَّةَ يَقُولُ إِنَّ اللَّهَ وَرَسُولَهُ حَرَّمَ بَيْعَ الْخَمْرِ وَالْمَيْتَةِ وَالْخِنْزِيرِ وَالأَصْنَامِ فَقِيلَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ شُحُومَ الْمَيْتَةِ فَإِنَّهُ يُطْلَى بِهَا السُّفُنُ وَيُدْهَنُ بِهَا الْجُلُودُ وَيَسْتَصْبِحُ بِهَا النَّاسُ قَالَ لاَ هُوَ حَرَامٌ ثُمَّ قَالَ رَسُولُ اللَّهِ ﷺ عِنْدَ ذَلِكَ قَاتَلَ اللَّهُ الْيَهُودَ إِنَّ اللَّهَ حَرَّمَ عَلَيْهِمُ الشُّحُومَ فَأَجْمَلُوهُ ثُمَّ بَاعُوهُ فَأَكَلُوا ثَمَنَهُ قَالَ وَفِي الْبَابِ عَنْ عُمَرَ وَابْنِ عَبَّاسٍ