Sayyidina Jabir ibn Abdullah (RA) narrated that he heard Allah’s Messenger say in the year of conquest (of Makkah) while he was at Makkah, “Indeed, Allah and His Messenger have forbidden the sale of wine, dead animal, swine and idols.” Someone asked. ‘0 Messenger of Allah! What do you say about fat of dead animal, for it is used to coat and plate ships and anoint skins, and people light lamps with it.” He said, “No, that is unlawful.” He added thereafter, “May Allah destroy the Jews! Allah made unlawful for them fat, they melted it and sold it and consumed its price.”
[Bukhari 2236 Muslim 1581, Abu Dawud 3486, Nisai 4669, Ibn e Majah 2167, Ahmed 14479]
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