Zaid bin Thabit said: The Messenger of Allah ﷺ used to offer the Zuhr prayer in midday heat; and no prayer was harder on the Companions of the Messenger of Allah ﷺ that this one. Hence the revelation came down: "Be guardians of your prayers, and of the midmost prayer" (2: 238). He (the narrator) said: There are two prayers before it and two prayers after it.