Which Surah was revealed to the Messenger all at once?

Many short surahs were revealed in their entirety, such as Surah Al-Kawthar, Al-Fil, Al-Ikhlas, and the two Mu'awwidhatayn. It is mentioned in some narrations that Surah Al-An'am was revealed all at once. It is also narrated that the Prophet, peace and blessings be upon him, said: "A surah was revealed to me last night, which is dearer to me than the world and everything in it," and that was Surah Al-Fath.