Sahih al-Bukhari Book 10, Hadith 64
I heard Anas saying, "A man from Ansar said to the Prophet, 'I cannot pray with you (in
congregation).' He was a very fat man and he prepared a meal for the Prophet (ﷺ) and invited him to his
house. He spread out a mat for the Prophet, and washed one of its sides with water, and the Prophet (ﷺ)
prayed two rak`at on it." A man from the family of Al-Jaruid asked, "Did the Prophet (ﷺ) used to pray
the Duha (forenoon) prayer?" Anas said, "I did not see him praying the Duha prayer except on that
day."
A cloud came and it rained till the roof started leaking and in those days the roof used to be of the branches of date-palms. Iqama was pronounced and I saw Allah's Messenger (ﷺ)s prostrating in water and mud and even I saw the mark of mud on his forehead.
The Prophet (ﷺ) said, "If supper is served, and Iqama is pronounced one should start with the supper."