Sahih Muslim 2543 b
Abu Dharr reported Allah's Messenger (ﷺ) as saying:
You would soon conquer Egypt and that is a land which is known (as the land of al-qirat). So when you conquer it, treat its inhabitants well. For there lies upon you the responsibility because of blood-tie or relationship of marriage (with them). And when you see two persons falling into dispute amongst themselves for the space of a brick, than get out of that. He (Abu Dharr) said: I saw Abd al-Rahman b. Shurahbil b. Hasana and his brother Rabi'a disputing with one another for the space of a brick. So I left that (land).
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، وَعُبَيْدُ اللَّهِ بْنُ سَعِيدٍ، قَالاَ حَدَّثَنَا وَهْبُ بْنُ جَرِيرٍ، حَدَّثَنَا 
 أَبِي، سَمِعْتُ حَرْمَلَةَ الْمِصْرِيَّ، يُحَدِّثُ عَنْ عَبْدِ الرَّحْمَنِ بْنِ شُمَاسَةَ، عَنْ أَبِي بَصْرَةَ، عَنْ أَبِي،
 ذَرٍّ قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ إِنَّكُمْ سَتَفْتَحُونَ مِصْرَ وَهِيَ أَرْضٌ يُسَمَّى
 فِيهَا الْقِيرَاطُ فَإِذَا فَتَحْتُمُوهَا فَأَحْسِنُوا إِلَى أَهْلِهَا فَإِنَّ لَهُمْ ذِمَّةً وَرَحِمًا ‏"‏ ‏.‏ أَوْ قَالَ ‏"‏
 ذِمَّةً وَصِهْرًا فَإِذَا رَأَيْتَ رَجُلَيْنِ يَخْتَصِمَانِ فِيهَا فِي مَوْضِعِ لَبِنَةٍ فَاخْرُجْ مِنْهَا ‏"‏ ‏.‏ قَالَ
 فَرَأَيْتُ عَبْدَ الرَّحْمَنِ بْنَ شُرَحْبِيلَ بْنِ حَسَنَةَ وَأَخَاهُ رَبِيعَةَ يَخْتَصِمَانِ فِي مَوْضِعِ لَبِنَةٍ فَخَرَجْتُ
 مِنْهَا ‏.‏