Musnad Ahmad 33:578

Surayj ibn al-Nu'man narrated to us, 'Abdullah ibn Nafi' narrated to us, from Ibn Abi Dhi'b, from the nephew of Jabir ibn 'Abdullah, from Jabir ibn 'Abdullah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Gatherings are held in trust, except for three gatherings: a gathering in which unlawful blood is shed, a gathering in which an unlawful private part is made lawful, and a gathering in which wealth is made lawful without right."