Secrets of Enoch (2 Enoch, Slavonic Enoch) 49:1
For I swear to you my children, but I will not swear by a single oath, neither by heaven, nor by earth, nor by any other creature which God made. God said: ‘There is no swearing in me, nor injustice, but truth. If there is no truth in men, let them swear by a word, yea, yea, or nay, nay.
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.