"It reached 'Umar that Samurah had sold some wine, and he said: 'May Allah ruin Samurah! Does he not know that the Messenger of Allah said: May Allah curse the Jews, for animal fat was forbidden to them, but they rendered it.' Sufyan (one of the narrators) said: "Meaning: They melted it down."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ قَاتَلَ اللَّهُ الْيَهُودَ حُرِّمَتْ عَلَيْهِمُ الشُّحُومُ فَجَمَّلُوهَا قَالَ سُفْيَانُ يَعْنِي أَذَابُوهَا