Sunan Abi Dawud 4912
سنن أبي داود#4912Da'ifحَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ بْنِ مَيْسَرَةَ، وَأَحْمَدُ بْنُ سَعِيدٍ السَّرْخَسِيُّ، أَنَّ أَبَا عَامِرٍ، أَخْبَرَهُمْ قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ هِلاَلٍ، قَالَ حَدَّثَنِي أَبِي، عَنْ أَبِي هُرَيْرَةَ، أَنَّ النَّبِيَّ صلى الله عليه وسلم قَالَ " لاَ يَحِلُّ لِمُؤْمِنٍ أَنْ يَهْجُرَ مُؤْمِنًا فَوْقَ ثَلاَثٍ فَإِنْ مَرَّتْ بِهِ ثَلاَثٌ فَلْيَلْقَهُ فَلْيُسَلِّمْ عَلَيْهِ فَإِنْ رَدَّ عَلَيْهِ السَّلاَمَ فَقَدِ اشْتَرَكَا فِي الأَجْرِ وَإِنْ لَمْ يَرُدَّ عَلَيْهِ فَقَدْ بَاءَ بِالإِثْمِ " . زَادَ أَحْمَدُ " وَخَرَجَ الْمُسَلِّمُ مِنَ الْهِجْرَةِ " .
Narrated AbuHurayrah: The Prophet (ﷺ) said: It is not allowable for a believer to keep from a believer for more than three days. If three days pass, he should meet him and give him a salutation, and if he replies to it they will both have shared in the reward; but if he does not reply he will bear his sin (according to Ahmad's version) and the one who gives the salutation will have come forth from the sin of keeping apart
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 43:140