Sahih al-Bukhari 1185, 1186

It is related from Mahmud ibn ar-Rabi' that he remembered the Messenger of Allah, may Allah bless him and grant him peace, and remembered him spitting a mouthful of water from a well in their house into his face. He said that he heard 'Itban ibn Malik al-Ansari, one of those who was present at Badr, say, 'I used to lead my people in prayer at Banu Salim and there was a river-bed between me and them. When the rains came, it was difficult for me to cross it to get to their mosque. So I went to the Messenger of Allah, may Allah bless him and grant him peace, and said to him, "Messenger of Allah, my eyesight is weak and when it rains, the water floods the river-bed between me and them so that I am unable to get to their mosque and lead them in the prayer. Messenger of Allah, I would very much like you to come and pray in my house so that I could take it as a prayer-place." The Messenger of Allah, may Allah bless him and grant him peace, said, "I will do that." The following day when the sun was well up, the Messenger of Allah, may Allah bless him and grant him peace, and Abu Bakr came and the Messenger of Allah, may Allah bless him and grant him peace, asked for permission to enter and I gave him permission. He did not sit down when he entered the house but said, "Where in your house would you like me to pray." I pointed out to him the place where I wanted to pray. The Messenger of Allah, may Allah bless him and grant him peace, stood and said the takbir, and we formed rows behind him. He prayed two rak'ats and then said the taslim and we said the taslim when he did. I persuaded him stay with us to eat a dish of khazira [meat soup] which had been prepared for him. The people of the area heard that the Messenger of Allah, may Allah bless him and grant him peace, was in our house and quite a number of their men gathered in the house and one of them said, "What has happened to Malik? I do not see him." Another of them said, "That man is a hypocrite who does not love Allah and His Messenger." The Messenger of Allah* said, "Do not say that. Do you not see that he has said, 'There is no god but Allah,' desiring by that nothing but the face of Allah?" The man said, "Allah and His Messenger know best, but, by Allah, we have only seen him loving and advising the hypocrites." The Messenger of Allah, may Allah bless him and grant him peace,said, "Allah has forbidden the Fire for anyone who says 'There is no god but Allah' desiring by that the face of Allah." ' " Mahmud said, "I related this to some people, one of whom was Abu Ayyub, the Companion of the Messenger of Allah, may Allah bless him and grant him peace, in the expedition in which he died, and over which Yazid ibn Mu'awiya had command, in Byzantine territory. Abu Ayyub objected to me saying it and said, 'By Allah, I do not think that the Messenger of Allah, may Allah bless him and grant him peace, ever said what you said.' That was hard for me to endure and I vowed to Allah that if I was spared, I would return from that expedition to ask 'Itban ibn Malik about it if I found him still alive in the mosque of his people. So I returned and put on ihram for hajj or 'umra and then travelled until I reached Madina. I went to the Banu Salim and 'Itban was an old blind man who still led his people in the prayer. When he said the taslim for the prayer, I greeted him and told him who I was and then asked him about that hadith. He related it to me as he had related it the first time."