Book of Enoch (1 Enoch) 14:6
And (that) previously you shall have seen the destruction of your beloved sons and ye shall have no pleasure in them, but they shall fall before you by the sword.
Background and history of Book of Enoch (1 Enoch), and issues with this book.
R. H. Charles, The Book of Enoch (London: SPCK, 1917), public domain. The verse text is the English Wikisource transcription of that translation. Charles’s editorial signs are kept. He rearranges some verses in chapters 5, 39, 90, 91, and 106, so those chapters are not a straight 1, 2, 3 sequence.