Salim ibn 'Abdullah reported from his father that 'Umar used to say to his sons, "Separate in the morning and do not meet together in the same house. I fear that you might split up or that some evil may take place between you."  

عَنْ أَبِيهِ كَانَ عُمَرُ يَقُولُ لِبَنِيهِ إِذَا أَصْبَحْتُمْ فَتَبَدَّدُوا وَلاَ تَجْتَمِعُوا فِي دَارٍ وَاحِدَةٍ فَإِنِّي أَخَافُ عَلَيْكُمْ أَنْ تَقَاطَعُوا أَوْ يَكُونَ بَيْنَكُمْ شَرٌّ  

Ibn 'Umar saw a shepherd with some sheep in a bad place and saw a place which was better than it. He told him, "Woe to you, shepherd! Move them! I heard the Messenger of Allah, may Allah bless him and grant him peace, say, 'Every shepherd is responsible for his flock.'"  

فَقَالَ لَهُ وَيْحَكَ يَا رَاعِي حَوِّلْهَا فَإِنِّي سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ كُلُّ رَاعٍ مَسْئُولٌ عَنْ رَعِيَّتِهِ  

Ibn 'Abbas reported that the Prophet, may Allah bless him and grant him peace, said, "We do not give a bad example. The one who takes back his gift is like the dog who returns to his own vomit."  

عَنِ النَّبِيِّ ﷺ قَالَ لَيْسَ لَنَا مَثَلُ السَّوْءِ الْعَائِدُ فِي هِبَتِهِ كَالْكَلْبِ يَرْجِعُ فِي قَيْئِهِ  

Abu Hurayra reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "The believer is guileless and generous while the corrupt is a swindler and miserly."  

قَالَ رَسُولُ اللهِ ﷺ الْمُؤْمِنُ غِرٌّ كَرِيمٌ وَالْفَاجِرُ خَبٌّ لَئِيمٌ