2 Kings 9:17

“And there stood a watchman on the tower of Jezreel, etc.] Who could see afar off when an enemy was coming, and his business was to give notice of it; and especially he was now on his watch tower, because the king was there, and this was necessary for his safety: and he spied the company of Jehu as he came, and said, I see a company; a troop of soldiers, though he did not know who they were, and to whom they belonged, whether they were Syrians or Israelites; which was reported to the king: and Joram said, take an horseman, and send to meet them, and let him say, is it peace? he might fear some ill had befallen his army at Ramothgilead, and the Syrians had got the advantage of them; or they…”

“there stood a watchman on the tower of Jezreel--The Hebrew palaces, besides being situated on hills had usually towers attached to them, not only for the pleasure of a fine prospect, but as posts of useful observation. The ancient watchtower of Jezreel must have commanded a view of the whole region eastward, nearly down to the Jordan. Beth-shan stands on a rising ground about six or seven miles below it, in a narrow part of the plain; and when Jehu and his retinue reached that point between Gilboa and Beth-shan, they could be fully descried by the watchman on the tower. A report was made to Joram in his palace below. A messenger on horseback was quickly despatched down into the plain to meet…”

“a watchman: Sa2 13:34, Sa2 18:24; Isa 21:6-9, Isa 21:11, Isa 21:12, Isa 56:10, Isa 62:6; Eze 33:2-9; Act 20:26-31 Take an horseman: Kg2 7:14 Is it peace: Kg2 9:19; Sa1 16:4, Sa1 17:22; Kg1 2:15; Luk 10:5, Luk 10:6 4 Kings (2 Kings) 9:18”