Sayyiduna Abu Hurayrah (may Allah be pleased with him) relates that the Messenger of Allah (peace and blessings be upon him) said: "When you come to the prayer while we are in prostration, then prostrate too, but do not count it (as a rak'ah). Whoever catches the rak'ah (with the bowing) has caught the prayer." This hadith is sahih; the two Shaykhs used all of its narrators as evidence except Yahya bin Abi Sulayman, who was an elder (shaykh) of the people of Madinah who settled in Egypt, and no criticism (jarh) of him has been reported.