Musnad Ahmad 30:3746

Abu Sa’id narrated to us, Zaidah narrated to us, al-A’mash narrated to us, from Abu Salih, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the heaviest of prayers upon the hypocrites are the late night prayer (Isha) and the dawn prayer (Fajr). And if they knew what is in them, they would have come to them even if crawling. And if one of you knew that he would find a bone of a fat sheep or two good targets, he would have come to them all. I have indeed considered ordering the prayer to be established, then ordering a man to lead the people in prayer, then taking bundles of firewood and going to those who stayed behind from the prayer and burning their houses down upon them." And Abu Mu’awiyah and Ibn Numayr narrated it to us, and this version is more complete.