Musnad Ahmad 32:2157

Bahz narrated to us, Shu'bah narrated to us, he said: Anas ibn Sirin informed me, he said: I heard Anas ibn Malik say: "There was a man from the Ansar who was large, and he could not pray with the Prophet, may Allah bless him and grant him peace. So he said: 'O Messenger of Allah, I cannot pray with you.' So he prepared food for him, and invited the Prophet, may Allah bless him and grant him peace, to it. They spread a mat for him and sprinkled it with water, and he prayed two rak'ahs upon it." A man from the family of Al-Jarud said to him: "Did the Messenger of Allah, may Allah bless him and grant him peace, pray Ad-Duha?" He said: "I did not see him pray it except on that day."