The Lord Himself shall descend from Heaven with a shout, with the voice of the archangel, and with the trump of God.
1 Thessalonians 4:16

Words: Theodore of the Studium, 826 (Τὴν ἡμέραν τὴν φριχτὴν τῆς). The hymn is part of the Canon for Sexagesima Sunday (the Sunday of the Meat-Fare, which focuses on the Last Judgment in the Eastern Orthodox calendar). Translated from Greek to English by John M. Neale, Hymns of the Eastern Church (London: J. T. Hayes, 1862). The first line of Neale’s original translation was That fearful Day, that Day of speechless dread.
The text below appears within [Neale’s] work on Theodore’s Canon for Judgment Day
(Gemini).
Music: Sessions Luther O. Emerson, 1847 (🔊 pdf nwc).

When Thou shalt come with trumpet sound,
With countless angels hovering round,
O Savior! grant me, in the air,
With all Thy saints, to meet Thee there!
Weep, O my soul! ere that great day
When God shall shine in stern array;
O weep Thy sin, that thou may’st be
In that severest judgment free!
O Christ, forgive, remit, protect,
And set Thy servant with th’elect,
That I may hear the voice that calls
The righteous to Thy heavn’ly halls!