English Translation
Narrated Anas bin Sirin: I heard Anas bin Malik al-Ansari saying, "An Ansari man, who was very fat, said to the Prophet, 'I am unable to present myself for the prayer with you.' He prepared a meal for the Prophet and invited him to his house. He washed one side of a mat with water and the Prophet offered two Rakat on it." So and so, the son of so and so, the son of AlJarud asked Anas, "Did the Prophet use to offer the Duha prayer?" Anas replied, "I never saw him praying (the Duha prayer) except on that day."
This hadith is from Sahih al-Bukhari, the most rigorously authenticated collection in Islamic scholarship. No editorial opinion is added.