وَعَنْ عُمَرَ رَضِيَ اللَّهُ عَنْهُ أَنَّ رَسُولَ اللَّهِ صَلَّى الله عَلَيْهِ وَسلم قَالَ: «قَاتَلَ اللَّهُ الْيَهُودَ حُرِّمَتْ عَلَيْهِمُ الشُّحُومُ فجملوها فَبَاعُوهَا»

‘Umar reported God’s Messenger as saying, "God curse the Jews! Fats were declared unlawful for them, but they melted them and sold them.” (Bukhari and Muslim.)