Jabir b. 'Abdullah said that a person entered the Mosque while the Messenger of Allah (may peace be upon him) was delivering the sermon on Friday. Upon this he (the Holy Prophet) said: Have you observed prayer? He said: No. He (the Holy Prophet) said: Stand and offer the two rak'ahs. According to Qutaiba, the words are:" He said: Offer two rak'ahs."