(1.) He must speak to them all that, and that only, which God spoke to him. He had said before (ch. ii. 7): Thou shalt speak my words to them; here he says (v. 4), Thou shalt speak with my words unto them, or in my words. He must not only say that which for substance is the same that God had said to him, but as near as may be in the same language and expressions. Blessed Paul, though a man of a very happy invention, yet speaks of the things of God in the words which the Holy Ghost teaches, 1 Cor. ii. 13. Scripture truths look best in scripture language, their native dress; and how can we better speak God's mind than with his words?