Isaiah 40:7

“The grass withereth, the flower fadeth, &c.] And so does man, and all his glory and goodliness: because the Spirit of the Lord bloweth upon it: alluding to some impetuous and blasting wind blowing upon herbs and flowers, to the withering and fading of them; (see <19A315>Psalm 103:15,16), legal ordinances ceased upon the pouring forth of the Spirit. The external excellencies of men, or their outward advantages, perish at the breath of God, at the blast of his nostrils, when taken away by death; and at conversion the Spirit of the Lord blows a blast upon all the goodliness of man; the operations of the Spirit are compared to wind, (<430308>John 3:8), which, like that, are free, and, as he…”

“spirit of the Lord--rather, "wind of Jehovah" (Psa 103:16). The withering east wind of those countries sent by Jehovah (Jon 4:8). the people--rather, "this people" [LOWTH], which may refer to the Babylonians [ROSENMULLER]; but better, mankind in general, as in Isa 42:5, so Isa 40:6, "all flesh"; this whole race, that is, man.”

“The grass withereth - Soon withers. Its beauty is soon gone. The flower fadeth - Soon fades; or fades when the wind of Yahweh passes over it. So is also with man. He loses his vigor, and dies at once when Yahweh takes away his strength and beauty. Because the spirit of the Lord bloweth upon it - This should be rendered, undoubtedly, ‘When the wind of Yahweh bloweth upon it.’ The word ‘spirit’ here does not suit the connection, and does not express the idea of the prophet. The word רוח rûach means, properly, “breath” - a breathing, or blowing; and is often used indeed to denote spirit, soul, life. But it often means a breath of wind; a breeze; air in motion Job 41:8; Jeremiah 2:24; Jeremiah…”

“40:7 The breath of the Lord refers to God’s spoken words of judgment (see 4:4).”