Al-Adab Al-Mufrad #408
Abandonment
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
حَدَّثَنَا إِسْمَاعِيلُ قَالَ: حَدَّثَنِي مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ أَبِي أَيُّوبَ الأَنْصَارِيِّ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: لاَ يَحِلُّ لِمُسْلِمٍ أَنْ يَهْجُرَ أَخَاهُ فَوْقَ ثَلاَثَةِ أَيَّامٍ، يَلْتَقِيَانِ فَيُعْرِضُ هَذَا وَيُعْرِضُ هَذَا، وَخَيْرُهُمَا الَّذِي يَبْدَأُ بِالسَّلامِ.
Abu Ayyub al-Ansari reported that the Messenger of Allah, may Allah
bless him and grant him peace, said, "It is not lawful for a Muslim to
refuse to speak to his (Muslim) brother for more than three days so that
when they meet, one goes this way and the goes that way. The better of
the two is the one who initiates the greeting."
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About Al-Adab Al-Mufrad
This hadith is #408 from Al-Adab Al-Mufrad, in the Book of Abandonment.