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‘A’idh b. ‘Amr told that he heard God’s Messenger say, “The worst shepherds are those who are ungentle.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَائِذِ بْنِ عَمْرٌو قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ يَقُولُ: «إِنَّ شرَّ الرعاءِ الحُطَمَة» . رَوَاهُ مُسلم
sunnah.com