Thus saith the LORD of hosts…Wherefore then didst thou not obey the voice of the LORD? – 2 Samuel 15:2,19

Such an authority has a “Thus saith the Lord,” that it is not to be despised without entailing upon the offender the severest penalty. Samuel came to Saul with “Thus saith the Lord,” and bade him destroy the Amalekites. He was utterly to cut them off, and not to spare so much as one of them. But Saul saved the best of the cattle and the sheep, and brought home Agag; and what was the result? His kingdom was taken from him and given to a neighbor of his that was better than he; and because he exalted himself beyond measure to do otherwise than according to the letter of God’s command, he was put away forever from having dominion over Israel. And mark this word: if any church in Christendom shall continue, after light is given and after plain rebuke is uttered, to walk contrary to the word of God, and to teach that which is inconsistent with Holy Scripture, as Saul was put away from the kingdom, so shall that church be put away from before the Lord of Hosts; and if any man, be he who he may, after receiving light from on high, continues willfully to shut his eyes, he shall not, if an heir of heaven, be rejected from eternal salvation, but he shall be cast off from much of the usefulness and comfort which he might otherwise have enjoyed. He knew his Master’s will and did it not: he shall be beaten with many stripes…O my brethren! I would that we trembled and stood more in awe of God’s word. I fear me that many treat the things of God as though they were merely matters of opinion but remember that opinion cannot govern in God’s house. God’s word, not man’s opinion, claims your allegiance. ~ C.H. Spurgeon

https://www.blueletterbible.org/Comm/spurgeon_charles/sermons/0591.cfm