Sahih al-Bukhari 13
Sahih al-Bukhari · Book 2: Belief · To like for one's (Muslim's) brother what one likes for himself is a part of faith
Narrated Anas:
حَدَّثَنَا مُسَدَّدٌ ، قَالَ حَدَّثَنَا يَحْيَى ، عَنْ شُعْبَةَ ، عَنْ قَتَادَةَ ، عَنْ أَنَسٍ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم. وَعَنْ حُسَيْنٍ الْمُعَلِّمِ، قَالَ حَدَّثَنَا قَتَادَةُ، عَنْ أَنَسٍ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " لا يُؤْمِنُ أَحَدُكُمْ حَتَّى يُحِبَّ لأَخِيهِ مَا يُحِبُّ لِنَفْسِهِ " .
The Prophet (ﷺ) said, "None of you will have faith till he wishes for his (Muslim) brother what he likes for himself."