It is narrated from Sayyiduna Sahl bin Hunayf (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Do not be harsh upon yourselves, for those before you perished only because of their harshness upon themselves; and you will find their remnants in the monks' cells and monasteries."
Hadith Referenceالمعجم الأوسط / باب الباء / 3078
Hadith Takhrij«أخرجه الطبراني فى «الكبير» برقم: 5551»