There was a heavyset man who was unable to pray with the Messenger of Allah ﷺ. He said to the Prophet ﷺ, "I cannot manage to pray with you, so if you would come to my house and pray there, I could follow your lead."The man prepared some food and then invited the Prophet ﷺ. He sprinkled water on a corner of their reed mat, and the Prophet ﷺ prayed two rakahs.A man from the family of Jarud asked Anas, "Did the Prophet ﷺ use to pray the Duha prayer?"He replied, "I never saw him pray it except on that day."
حدثنا محمد بن جعفر حدثنا شعبة عن أنس بن سيرين
كان رجل ضخم لا يستطيع أن يصلي مع رسول الله ﷺ فقال للنبي ﷺ إني لا أستطيع أن أصلي معك فلو أتيت منزلي فصليت فأقتدي بك فصنع الرجل طعاما ثم دعا النبي ﷺ فنضح طرف حصير لهم فصلى النبي ﷺ ركعتين فقال رجل من آل الجارود لأنس وكان النبي ﷺ يصلي الضحى قال ما رأيته صلاها إلا يومئذ
Its isnad is sahih. The hadith is found in Bukhari 2/157, no. 670, Fath, in the Book of Adhan, chapter on whether the imam should pray with those who are present, and in Abu Dawud 1/177, no. 657, in the Book of Prayer, chapter on praying on a mat.