In an article by the University of St. Andrews about the Book of 6 Ezra, it is stated:
In the Syriac text of 4 Ezra 14:48 (and the versions that derive from it) there is a brief account of the ascent and apotheosis of Ezra which is missing in the Latin of 2 Esdras.
I am currently trying to find out where this is found. The only place in 4 Ezra where I could find anything similar to this is 4 Ezra 2:42-48
I Esdras saw upon the mount Sion a great people, whom I could not number, and they all praised the Lord with songs. And in the midst of them there was a young man of a high stature, taller than all the rest, and upon every one of their heads he set crowns, and was more exalted; which I marvelled at greatly. So I asked the angel, and said, Sir, what are these? He answered and said unto me, These be they that have put off the mortal clothing, and put on the immortal, and have confessed the name of God: now are they crowned, and receive palms. Then said I unto the angel, What young person is it that crowneth them, and giveth them palms in their hands? So he answered and said unto me, It is the Son of God, whom they have confessed in the world. Then began I greatly to commend them that stood so stiffly for the name of the Lord. Then the angel said unto me, Go thy way, and tell my people what manner of things, and how great wonders of the Lord thy God, thou hast seen.
Is this the account of the ascent and apotheosis of Ezra, or is the article speaking about something else?