Al-Adab Al-Mufrad #401
Abandonment
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 بْنُ صَالِحٍ قَالَ: حَدَّثَنِي اللَّيْثُ قَالَ: حَدَّثَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ ثُمَّ الْجُنْدَعِيِّ، أَنَّ أَبَا أَيُّوبَ صَاحِبَ رَسُولِ اللهِ صلى الله عليه وسلم أَخْبَرَهُ أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: لاَ يَحِلُّ لأَحَدٍ أَنْ يَهْجُرَ أَخَاهُ فَوْقَ ثَلاَثِ لَيَالٍ، يَلْتَقِيَانِ فَيَصُدُّ هَذَا وَيَصُدُّ هَذَا، وَخَيْرُهُمَا الَّذِي يَبْدَأُ بِالسَّلامِ.
Abu Ayyub, the Companion of the Messenger of Allah, may Allah bless
him and grant him peace, said, "It is not lawful for anyone to cut himself
off from his Muslim brother for more than three nights so that when they
meet, one of them turns his face away in avoidance and the other one turns
his face away as well. The better of them is the one who initiates the
greeting."
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About Al-Adab Al-Mufrad
This hadith is #401 from Al-Adab Al-Mufrad, in the Book of Abandonment.