Here, I. The prefaces to the message are very solemn and such as may engage our most serious attention. 1. The people are commanded to give audience: Hear you now what the Lord says. What the prophet speaks he speaks from God, and in his name; they are therefore bound to hear it, not as the word of a sinful dying man, but of the holy living God. Hear now what he saith, for, first or last, he will be heard. 2. The prophet is commanded to speak in earnest, and to put an emphasis upon what he said: Arise, contend thou before the mountains, or with the mountains, and let the hills hear thy voice, if it were possible; contend with the mountains and hills of Judea, that is, with the inhabitants of those mountains and hills; and, some think, reference is had to those mountains and hills on which they worshipped idols and which were thus polluted. But it is rather to be taken more generally, as appears by his call, not only to the mountains, but to the strong foundations of the earth, pursuant to the instructions given him. This is designed, (1.) To excite the earnestness of the prophet; he must speak as vehemently as if he designed to make even the hills and mountains hear him, must cry aloud, and not spare; what he had to say in God's name he must proclaim publicly before the mountains, as one that was neither ashamed nor afraid to own his message; he must speak as one concerned, as one that desired to speak to the heart, and therefore appeared to speak from the heart. (2.) To expose the stupidity of the people; "Let the hills hear thy voice, for this senseless careless people will not hear it, will not heed it. Let the rocks, the foundations of the earth, that have no ears, hear, since Israel, that has ears, will not hear." It is an appeal to the mountains and hills; let them bear witness that Israel has fair warning given them, and good counsel, if they would but take it. Thus Isaiah begins with, Hear, O heavens! and give ear, O earth! Let them judge between God and his vineyard.