Mishkat al-Masabih #983

Muhammad b. Ibrahim on the authority of Qais b. ‘Amr told how when the prophet saw a man praying two rak'as after the Morning Prayer he said, “At the Morning Prayer pray two rak'as." The man replied I had not prayed the two rak'as which precede them, so I prayed themjust now,” and God’s Messenger said nothing. Abu Dawud transmitted it. Tirmidhi transmitted something similar, saying, “The isnad of this tradition is not connected, because Muhammad b. Ibrahim did not hear from Qais b. ‘Amr.” There is something similar in Sharh as-sunna and in some texts of al-Masabih from Qais b. Qahd.