Anas (RAA) narrated that the Messenger of Allah (ﷺ) said:
"By Him in Whose Hand my soul is, a slave of Allah does not truly believe till he wishes for his neighbor what he wishes for himself." Agreed upon. (RU)
English reference (RU): Book 16, Hadith 1501 (RU)
Arabic reference (RU): Book 16, Hadith 1458 (RU)