Luke 21:10

Then said he unto them, Nation shall rise against nation, and kingdom against kingdom:

Cross-reference

Zechariah 14:2 describes all nations gathered against Jerusalem in battle — a specific instance of the international conflict Jesus foretells.

Mark 13:8 Parallel

Mark 13:8 records the identical saying about nations rising — a parallel account of Jesus' Olivet Discourse.

Revelation 6:2-12 details war, famine, and cosmic signs — paralleling the end-time judgments described here.

Zechariah 14:3 shows the LORD going out to fight those nations — the divine intervention following the conflict Jesus predicts.