It is narrated from Sayyiduna Shaddad bin Aws (may Allah be pleased with him), and this was confirmed by Sayyiduna Ubadah bin Samit (may Allah be pleased with him), who was present in the gathering, that once we were present in the service of the Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) asked: "Is there any stranger (someone from the People of the Book) among you?" We replied: "No, O Messenger of Allah!" The Prophet (peace and blessings be upon him) ordered the doors to be closed and said: "Raise your hands and say «لا اله الا الله» ." So we raised our hands. After a short while, the Prophet (peace and blessings be upon him) lowered his hands and said: "All praise is due to Allah! O Allah! You sent me with this word, You commanded me with it, You promised me Paradise for it, and You do not break Your promise." Then he said: "Rejoice, for Allah has forgiven you."