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