Isaiah 21:11 is another oracle in the same chapter, with a watchman answering 'what of the night?' — same sentinel imagery.

Isaiah 62:6 also speaks of God setting watchmen, but over Jerusalem's walls — a different city but same prophetic role as the watchman in 21:6.

2 Kings 9:17-20 features a literal watchman on a tower spotting Jehu — closely mirroring the watchman's role in 21:6 who declares what he sees.

Ezekiel 3:17 directly parallels the watchman metaphor: God appoints a prophet to receive and deliver His word.

Ezekiel 33:2-7 expands the watchman metaphor — the prophet is set as a sentinel to warn God's people.

Habakkuk 2:1 shows the prophet voluntarily taking a watchman's station to see God's answer — same sentinel posture.