I have put these two verses together, not only because of their identity in form, though that is striking, but because they bear upon one and the same subject, as will appear, if, in a word or two, I set each of them in its setting. David was almost at the lowest point of his fortunes when he fled into foreign territory, and for awhile took service under one of the kings of the Philistines. He served him faithfully, and so, when the last great fight, in which Saul lost his life, was about to be waged between Philistia and Israel, David and his men came as a contingent to the army of the former. The Philistine commanders, very naturally, were suspicious of these allies, just as Englishmen would have been if, on the night before Waterloo, a brigade of Frenchmen had deserted and offered their help to fight Napoleon. So the question What do these Hebrews here?'--amongst our ranks--was an extremely natural one, and it was answered in the only possible way, by the subsequent departure of David and his men from the unnatural and ill-omened alliance.
Now, that suggests to us that Christian people are out of their places, even in the eyes of worldly people, when they are fighting shoulder to shoulder with them in certain causes; and it suggests the propriety of keeping apart. Come ye out from among them, and be ye separate, saith the Lord.' What do these Hebrews here?' is a question that Philistia often asks.
But now turn to the other question. Elijah had fallen into the mood of depression which so often follows great nervous tension. He had just offered the sacrifice on Carmel, and brought all Israel back to the Lord, and Jezebel had flamed out and threatened his life. The usually undaunted prophet, in the reaction after his great effort, was fearful for his life and deserted his work, flung himself into solitude and shook the dust off his feet against Israel. Was that not just doing what I have been saying that Christian people ought to do--separating himself from the world? In a sense, yes, but the voice came, What dost thou here, Elijah?' Go back to your work; to Ahab, to Jezebel. Go back to death if need be. Do not shirk your duty on the pretence of separating yourself from the world.'
So we put the two questions together. They limit one another, and they suggest the via media, the course between, and lead me to say one or two plain things about that duty of Christian separation from an evil world.