Asim bin Damrah reports that once a person asked Sayyiduna Ali (may Allah be pleased with him) how the Prophet (peace and blessings be upon him) used to offer voluntary prayers during the day. He replied that the Prophet (peace and blessings be upon him) used to offer a total of sixteen rak‘ahs. After performing the Fajr prayer, he would wait for a short while, and when the sun had risen in the east to the extent that it is in the west after the ‘Asr prayer, he would stand and offer two rak‘ahs of prayer. Then he would wait for a short while, and when the sun had risen in the east to the extent that it is in the west after the Zuhr prayer, he would stand and offer four rak‘ahs of prayer. Then, after the sun had passed its zenith, he would offer four rak‘ahs before Zuhr, two rak‘ahs after Zuhr, and four rak‘ahs before ‘Asr.