The watchman’s roles are three. First, perceive — see what is coming, attend to the horizon, refuse to sleep at the post ("Watchman, what of the night?", Isaiah 21:11). Second, warn — sound the trumpet so the people can prepare: Ezekiel 33:6: "if the watchman see the sword come, and blow not the trumpet... his blood will I require at the watchman’s hand." Third, intercede — cry to God on behalf of those he watches: "I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night: ye that make mention of the LORD, keep not silence" (Isaiah 62:6-7). Habakkuk 2:1 models the standing. Failure on any of the three leaves the watchman accountable.
(Composite.) The three duties of the biblical watchman: perceive, warn, intercede.
Ezekiel 33:6-7 codifies the duties: God appoints; the watchman hears the word; the watchman warns; if he fails to warn, the blood is on his hand.
Isaiah 62:6-7 adds intercession: I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night... give him no rest, till he establish, and till he make Jerusalem a praise in the earth.
Ezekiel 33:6 — "But if the watchman see the sword come, and blow not the trumpet, and the people be not warned... his blood will I require at the watchman's hand."
Ezekiel 33:7 — "So thou, O son of man, I have set thee a watchman unto the house of Israel; therefore thou shalt hear the word at my mouth, and warn them from me."
Habakkuk 2:1 — "I will stand upon my watch, and set me upon the tower, and will watch to see what he will say unto me."
Isaiah 62:6 — "I have set watchmen upon thy walls, O Jerusalem, which shall never hold their peace day nor night."
Modern pastors are often expected only to encourage; Scripture's watchman is also expected to warn and to intercede.
Ezekiel 33 makes the warning a job description with eternal stakes. The watchman who softens the warning, omits the warning, or specializes in encouragement only is failing the office.
Isaiah 62 adds the third duty: never holding peace day or night, giving the LORD no rest till He establishes Jerusalem. The watchman intercedes. The household needs men in both halves — trumpet sounded outward, prayer rising upward.
Hebrew tsophe covers the office and its duties.
Hebrew tsophe — watchman, lookout; from tsaphah, to look out, scan.
Note: usmcmin.org's Watchman page leans heavily on this word-family; the office is foundational to the ministry.
"The watchman perceives, warns, intercedes — all three."
"A watchman who only encourages is failing the office."
"Sound the trumpet outward; pray upward; both."