Musnad Ahmad Hadith 20043

It is narrated from Muawiyah Bahzi (may Allah be pleased with him) that he said to the Prophet (ﷺ): I had sworn so many times (opening the fingers of his hands to count) that I would not come to you, but now I have come to you, so tell me, with what has Allah sent you? The Prophet (ﷺ) said: Allah has sent me with Islam. He asked: What is Islam? The Prophet (ﷺ) said: Say, "I have submitted myself before Allah and have turned to Him alone," and establish prayer and pay zakat, and remember! Every Muslim is honorable to another Muslim. These two things are supportive, and Allah does not accept the repentance of the one who, after accepting Islam or after leaving the polytheists and coming to the Muslims, falls back into polytheism. What is this matter that I am grabbing you by your waists and saving you from Hellfire? Remember! My Lord will inform me and ask me: "Did you convey My message to My servants?" And I will say: "O Lord! I conveyed Your message to them." Remember! Whoever among you is present should convey this to those who are absent. On the Day of Resurrection, when you will be presented, a seal will be set upon your mouths, and the first thing to speak will be your thigh. I said: O Messenger of Allah! Is this our religion? The Prophet (ﷺ) said: This is your religion, and wherever you do a good deed, it will suffice for you.