It is narrated from Sayyiduna Khalid bin Hakim bin Hizam (may Allah be pleased with him) that Sayyiduna Abu Ubaydah (may Allah be pleased with him) dealt harshly with a man from the people of the land, and Sayyiduna Khalid bin Hakim (may Allah be pleased with him) forbade him from doing so. The people said to Khalid: "You have angered Abu Ubaydah." He said: "I have not angered him; rather, I heard the Messenger of Allah (peace and blessings be upon him) say: 'The one who punishes people most severely in this world will be the one most severely punished in the sight of Allah on the Day of Resurrection.'"
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4106
Abu Najih narrates: Khalid bin Hakim (may Allah be pleased with him) passed by Abu Ubaydah bin al-Jarrah (may Allah be pleased with him) while he was punishing people over the jizyah. He said to him: "Have you not heard the Messenger of Allah (peace and blessings be upon him) say: 'The one who punishes people most severely in this world will be the one most severely punished on the Day of Resurrection'?" At this Abu Ubaydah said: "Go, and let them go."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 4107