Urwah bin al-Zubayr (may Allah have mercy on him) said: I asked Abdullah bin Amr bin al-As (may Allah be pleased with them both), saying: Tell me of the most severe harm the polytheists inflicted on the Prophet (peace and blessings be upon him). He said: Uqbah bin Abi Mu'ayt came while the Messenger of Allah (peace and blessings be upon him) was praying near the Ka'bah. He wrapped a cloth around his neck and choked him hard. Then Abu Bakr al-Siddiq (may Allah be pleased with him) came, seized him by both shoulders, pushed him away from the Messenger of Allah (peace and blessings be upon him) and said: "Would you kill a man because he says, 'My Lord is Allah,' when he has brought you clear proofs from your Lord?" [Surah Ghafir: 28]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب السير / 17728