It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: "There is no one who goes out of his house except that there are two banners at his door: one banner in the hand of an angel and one banner in the hand of a devil. If he goes out for something that Allah loves, the angel follows him with his banner, and he remains under the angel's banner until he returns to his house; and if he goes out for something that angers Allah, the devil follows him with his banner, and he remains under the devil's banner until he returns."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is not narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) except with this chain, and Uthman bin Muhammad al-Akhnasi (may Allah have mercy on him) is alone in narrating it."