Shaykh Muhammad Al-Uthaymeen [D. 1421 A.H.] [رحمه الله] said:
«إِذَا كُنْتَ لَا تُحِبُّ لِأَخِيكَ مَا تُحِبُّ لِنَفْسِكَ فَأَنْتَ مُصِرٌّ عَلَىٰ كَبِيرَةٍ مِنْ كَبَائِرِ الذُّنُوبِ.»
❝If you did not love for your brother what you love for yourself, then you are persistent upon a sin from the major sins.❞
[Fateh Dhil Jilal Wal Ikram, (3/536) | Translated By Abbas Abu Yahya Miraath Al-Anbiyya]