What was the last surah to be compiled from the Noble Quran?

Summary of the answer:

Al-Bukhari reported from Zayd ibn Thabit the story of his compilation of the Qur’an by order of Abu Bakr and Umar. Umar saw that the killing of Qur’an reciters had intensified, and he feared that much of the Qur’an might be lost, so he suggested compiling the Qur’an. Abu Bakr and Zayd initially hesitated because the Prophet, peace and blessings be upon him, had not done so, but Allah expanded their hearts after Umar and Abu Bakr revisited the matter with them. Zayd tracked down the Qur’an and compiled it from palm-leaf stalks, flat stones, and the hearts of men. He found the end of Surat At-Tawbah (from the verse: “There has certainly come to you a Messenger”) only with Abu Khuzaymah Al-Ansari. The scrolls were then with Abu Bakr, then Umar, then Hafsa. This indicates that the last part of the Qur’an to be compiled was the conclusion of Surat At-Tawbah.