Surah 43. Az-Zukhruf, Ayah 61

Whereas most of the commentators regard the pronoun hu in innahu as relating to Jesus and, consequently, interpret the above phrase as "he is indeed a means to know [i.e., an indication of the coming of] the Last Hour", some authorities - e.g., Qatadah, Al-Hasan al-Basri and Sa'id ibn Jubayr (all of them quoted by Tabari, Baghawi and Ibn Kathir) - relate the pronoun to the Qur'an, and understand the phrase in the sense adopted in my rendering. The specific mention of the Last Hour in the above context is meant to stress man's ultimate responsibility before the Creator and, therefore, the fact that worship is due to Him alone: and so this parenthetic passage follows logically upon the mention of the false deification of Jesus.

This is understood to refer to the second coming of Jesus in the Last Days before the Resurrection, when he will destroy the false doctrines that pass under his name, and prepare the way for the universal acceptance of Islam, the Gospel of Unity and Peace, the Straight Way of the Qur-an.