It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that a man from Ghatafan came on Friday while the Messenger of Allah (peace and blessings be upon him) was delivering the sermon, and the Messenger of Allah (peace and blessings be upon him) said to him: "Have you prayed?" He said: No. He (peace and blessings be upon him) said: "Perform two prostrations and keep them short."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6673