Musannaf Ibn Abi Shayba 1:1430

1430. Humayd ibn Abd al-Rahman narrated to us, from Musa ibn Abi al-Furat, who said: Two men asked Ata. He said: "A man passed by us, and we said, 'The effeminate one (al-mukhannath).'" He said: "Did you say that to him before you prayed or after you prayed?" They said: "Before we prayed." He said: "Perform ablution and repeat your prayer, for you had no prayer."