Secrets of Enoch (2 Enoch, Slavonic Enoch) 18:9
And they listened to my rebuke. And they stood in the four orders in this heaven, and lo! as I was standing with these men, four trumpets resounded together with a loud voice, and the Grigori sang with one voice, and their voices went forth before the Lord with sadness and tenderness.
Background and history of Secrets of Enoch (2 Enoch, Slavonic Enoch), and issues with this book.
W. R. Morfill’s translation from the Slavonic, edited with introduction, notes, and indices by R. H. Charles, The Book of the Secrets of Enoch (Oxford: Clarendon Press, 1896). Public domain in the United States. Morfill died in 1909 and Charles died in 1931, so the book is in the public domain in the United Kingdom. The verses are transcribed from the Internet Archive scan bookofsecretsofe00morf. Charles’s footnotes, exegetical notes, and bracketed section headings are left out. Charles prints the longer A text and gives B and Sokolov’s manuscript in his notes. Square brackets inside verses are his.