John Gill Commentary Jeremiah 50:27

"Slay all her bullocks; let them go down to the slaughter: woe unto them! for their day is come, the time of their visitation." — Jeremiah 50:27 (ASV)

Slay all her bullocks Or, "all her mighty ones", as the Targum and Vulgate Latin version; her princes and great men, as Jarchi, Kimchi, and Abarbinel; compared to bullocks for their strength, fatness, and fierceness; see (Psalms 22:12Psalms 22:13) ; this may well be applied to the slaughter of kings, captains, and mighty men, at the battle of Armageddon, (Revelation 19:18) ;

let them go down to the slaughter ; to the place slaughter, as oxen do, insensible, and whether they will or not:

woe unto them, for their day is come, the time of their visitation ; the time of their destruction, of visiting or punishing them for their sins, appointed by the Lord, which they could not pass; and so a woeful and dreadful time to them.