Albert Barnes Commentary Ezekiel 37:4

"Again he said unto me, Prophesy over these bones, and say unto them, O ye dry bones, hear the word of Jehovah." — Ezekiel 37:4 (ASV)

Prophesy - Not in the sense of predicting what was to happen, but simply in the sense of speaking under the inspiration of God. In Ezekiel 37:5, not I will cause, but I cause or am causing.