From Sahih Bukhari (Hadith 3678):
Narrated `Urwa bin Az-Zubair:I asked `Abdullah bin `Amr, "What was the worst thing the pagans did to Allah's Messenger (ﷺ)?" He said, "I saw `Uqba bin Abi Mu'ait coming to the Prophet (ﷺ) while he was praying.' `Uqba put his sheet round the Prophet's neck and squeezed it very severely. Abu Bakr came and pulled `Uqba away from the Prophet and said, "Do you intend to kill a man just because he says: 'My Lord is Allah, and he has brought forth to you the Evident Signs from your Lord?
Reference: Bukhari 3678