Revelation 14:15
And another angel came out of the temple, crying with a loud voice to him that sat on the cloud, Thrust in thy sickle, and reap: for the time is come for thee to reap; for the harvest of the earth is ripe.
Cross-reference
Revelation 14:14 introduces the Son of Man on a cloud with a sickle; here the angel directs Him to begin reaping. Direct sequential connection within the vision.
Revelation 14:18 continues the vision with another angel gathering the vine — the same judgment scene expanded.
Revelation 14:17 continues the scene with another angel also carrying a sickle — immediate sequential partner in the harvest judgment.
Revelation 11:19 shows the heavenly temple opened — the angel in this verse comes out of that same temple, linking the judgment to God's presence.
In Revelation 6:10, martyrs cry out 'How long until You judge?' — the angel here announces that the time for judgment has finally arrived.
Revelation 16:17 also features a loud voice from the temple declaring 'It is done!' — echoing the angel's cry here that the time for reaping has come.
In Jeremiah 51:33, Babylon's harvest time of judgment is prophesied — the same harvest imagery used here for the final judgment of the earth.
Joel 3:13 uses the same 'sickle to harvest' imagery for divine judgment — the OT source John's vision echoes.
Matthew 13:30 presents the harvest as separation of wheat and tares — a judgment parable parallel to this imagery.
Matthew 13:39 interprets the harvest as the end of the age with angels as reapers — directly explaining this symbol.
Isaiah 17:5 compares judgment to a harvestman reaping corn — a direct OT harvest metaphor for divine punishment.
Hosea 6:11 explicitly uses 'harvest' metaphor for divine judgment on Judah — directly parallels the reaping imagery here.