Hadith #13 (The Forty Hadith of Imam Nawawi)
Book: Loving for one's brother what one loves for oneself
Narrator(s): Abu Hamzah Anas ibn Malik
Grade: Sahih

None of you [truly] believes until he loves for his brother that which he loves for himself.

Source: https://parallelquran.com/hadith/forty-nawawi-13/