Hawzah News Agency – The commander of the faithful, Imam Ali peace be upon him says:

لا يَسلَمُ لكَ قَلبُكَ حتّى‏ تُحِبَّ للمُؤمنينَ ما تُحِبُّ لنفسِكَ.

'Your heart will not be sound unless you love for the believers what you love for yourself.'

Source: Bihar al-Anwar, v. 78, p. 8, no. 64