Musnad Ahmad 30:2359

Abu Mu'awiyah narrated to us, he said: Al-A'mash narrated to us, and Ibn Numayr said: Al-A'mash informed us, from Abu Salih, from Abu Hurayrah, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The heaviest of prayers upon the hypocrites are the Isha prayer and the Fajr prayer. And if they knew what is in them, they would have come to them even if crawling. And I have indeed intended to order the mu'adhdhin to call the adhan, then order a man to lead the people in prayer, then I would go with men carrying bundles of firewood to a people who stay behind from the prayer, and I would burn their houses down upon them with fire."