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. (JA)
English reference (JA): Book 16, Hadith 1501 (JA)
Arabic reference (JA): Book 16, Hadith 1458 (JA)