Musnad Abu Ya'la al-Mawsili 109:197

Sufyan narrated to us, my father narrated to us, from Usamah bin Zayd, from Ibn al-Munkadir, from Jabir, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Ask Allah for beneficial knowledge, and seek refuge in Allah from knowledge that does not benefit."