2 Kings 9:17-18

There stood a watchmen on the tower For watchmen were set on high places in time of peace as well as war wherever the king was, that he might not be surprised. Let him say, Is it peace? Inquire who it is that comes, and if he comes on peaceable terms. For he feared lest either the Syrians had prevailed at Ramoth-gilead, or some sedition or rebellion was raised against him, which the example of Libnah, and his own guilty conscience, made him fear. Jehu said, What hast thou to do with peace? It is not to thee, but to him that sent thee, that I will give answer. Turn thee behind me Join thyself to my followers, if thou wishest for safety. This order he did not dare to disobey, seeing such a company of soldiers with Jehu.