It is narrated from Sayyiduna Sulayk al-Ghatafani (may Allah be pleased with him) that he came while the Messenger of Allah (peace and blessings be upon him) was delivering the sermon on the pulpit, and the Messenger of Allah (peace and blessings be upon him) said to him: "Have you prayed two rak'ahs?" He said: No. He (peace and blessings be upon him) said: "Then pray two rak'ahs and keep them short."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 6682