Anas ibn Malik reported: The Prophet, peace and blessings be upon him, said:

لا يَبْلُغُ عَبْدٌ حَقِيقَةَ الإِيمَانِ حَتَّى يُحِبَّ لِلنَّاسِ مَا يُحِبُّ لِنَفْسِهِ مِنَ الْخَيْرِ

The servant does not attain the reality of faith until he loves for people what he loves for himself of goodness.

Source: Ṣaḥīḥ Ibn Ḥibbān 238, Grade: Sahih