Sayyiduna Abu Ayyub (may Allah be pleased with him) said to Marwan bin al-Hakam: The Messenger of Allah (peace and blessings be upon him) said: "Do not weep over the religion when you entrust it to those who are worthy of it; rather, weep over it when you entrust it to those who are not worthy of it."
Hadith Referenceالمعجم الكبير للطبراني / باب الخاء / 3984