Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) used to be guarded, so his uncle Abu Talib would send some men of Banu Hashim with him every day to guard him, until this verse was revealed: "O Messenger, convey what has been sent down to you from your Lord" up to "and Allah will protect you from the people" [Surah al-Ma'idah: 67]. Then his uncle wanted to send someone with him to guard him, and he (peace and blessings be upon him) said: "O uncle, Allah, the Mighty and Majestic, has protected me from the jinn and mankind."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 11613