Al-Adab Al-Mufrad #1325
Anger
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا عَبْدُ اللهِ، قَالَ: حَدَّثَنَا مَرْوَانُ بْنُ مُعَاوِيَةَ، قَالَ: حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ الْكِنْدِيُّ، عَنْ أَبِيهِ قَالَ: سَمِعْتُ عَلِيًّا يَقُولُ لِابْنِ الْكَوَّاءِ: هَلْ تَدْرِي مَا قَالَ الأَوَّلُ؟ أَحْبِبْ حَبِيبَكَ هَوْنًا مَا، عَسَى أَنْ يَكُونَ بَغِيضَكَ يَوْمًا مَا، وَأَبْغِضْ بَغِيضَكَ هَوْنًا مَا، عَسَى أَنْ يَكُونَ حَبِيبَكَ يَوْمًا مَا.
'Ali was heard to say to Ibn al-Kawwa', "Do you know what the
first one said? 'Loving the one you love is an easy matter. It may be that
one day he will be the one you hate. Hating the one who hate is an easy
matter, It may be that one day he will be the one you hate.'"
About Al-Adab Al-Mufrad
This hadith is #1325 from Al-Adab Al-Mufrad, in the Book of Anger.