Musannaf Ibn Abi Shayba 35:436

Hafs ibn Ghiyath narrated to us, from al-A'mash, from Abu Sufyan, from Jabir, who said: Sulayk al-Ghatafani came while the Prophet, may Allah bless him and grant him peace, was delivering the sermon on a Friday. He said to him, "Have you prayed?" He said, "No." He said, "Pray two rak'ahs and make them brief."