Bukhari

Narrated Abu Huraira: The Prophet said, "No prayer is harder for the hypocrites than the Fajr and the `Isha' prayers and if they knew the reward for these prayers at their respective times, they would certainly present themselves (in the mosques) even if they had to c awl." The Prophet added, "Certainly I decided to order the Mu'adh-dhin (call-maker) to pronounce Iqama and order a man to lead the prayer and then take a fire flame to burn all those who had not left their houses so far for the prayer along with their houses."