It was narrated that Zirr bin Hubaish said:
"I went to Safwan bin 'Assal Al-Muradi and he said: 'What brought you here?' I said: 'I am seeking knowledge.' He said: 'I heard the Messenger of Allah say: "There is no one who goes out of his house in order to seek knowledge, but the angels lower their wings in approval of his action.'" (ID)
English reference (ID): Vol. 1, Book 1, Hadith 226 (ID)
Arabic reference (ID): Book 1, Hadith 231 (ID)