Zaid b. Thabit said that God’s Messenger made an apartment of reed mats in the mosque and prayed in it for some nights until people gathered round him. One night when they missed his voice and thought he had gone to sleep, some of them began to clear their throats in order that he might come out to them, so he said, “What I have seen you doing has continued to be your practice, so that I have been afraid that it might be prescribed for you, and if it were prescribed for you you would not fulfil it. You people should therefore pray in your houses, for, with the exception of the prescribed prayer, the most excellent prayer a man observes is that which he observes in his house.” (Bukhari and Muslim.)