Musnad Abu Ya'la al-Mawsili 147:25

Abu Bakr ibn Abi Shaybah narrated to us, Ibn ‘Ulayyah narrated to us, from Ibn ‘Awn, from Anas ibn Sirin, from ‘Abd al-Hamid ibn al-Mundhir ibn al-Jarud, from Anas ibn Malik, who said: Some of my paternal uncles prepared food for the Prophet (peace be upon him). He said, "I would like for you to eat in my house and pray in it." He said: So he came to him, and in the house was a mat from those mats. He ordered a side of it to be swept and sprinkled [with water], so he prayed and we prayed with him.