What did the Prophet Muhammad (saw) do when an Ansari man who was too fat to present himself for the prayer invited him to his house?
      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      Al-Jarud 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."