(24) The sound of a going.--After David has gone to the rear of his enemies, he is to wait by "the mulberry trees," or, as now generally understood, baca-shrubs, a plant resembling the balsam. Here a Divine signal was to be given him in "the sound of a going," or, rather, of a march. The word is used of the march of the hosts of the Lord in Judges 5:4; Psalm 68:7. Then David was to "bestir himself," literally, be sharp; he was to act quickly and vigorously.

Verse 24. - The sound of a going; Hebrew, a marching. Under the cover of this thicket David was to wait until he heard the sound as of the regular tramp of an army in the tops of the baca trees. It would be in the morning that the wind would shake the treetops, but the sound was to be something more than the soft whispers of a gentle breeze. A gale was to put them into sudden motion, and then the soldiers would know that their Jehovah had gone forth to battle, and David must immediately bestir himself. The enthusiasm of his men must not cool down, but as soon as the wind rustled he must charge the enemy, and his warriors, feeling that they were going with the host of God, would break down all resistance by their impetuous onset.

5:17-25 The Philistines considered not that David had the presence of God with him, which Saul had forfeited and lost. The kingdom of the Messiah, as soon as it was set up in the world, was thus attacked by the powers of darkness. The heathen raged, and the kings of the earth set themselves to oppose it; but all in vain, Ps 2:1, &c. The destruction will turn, as this did, upon Satan's own kingdom. David owns dependence on God for victory; and refers himself to the good pleasure of God, Wilt thou do it? The assurance God has given us of victory over our spiritual enemies, should encourage us in our spiritual conflicts. David waited till God moved; he stirred then, but not till then. He was trained up in dependence on God and his providence. God performed his promise, and David failed not to improve his advantages. When the kingdom of the Messiah was to be set up, the apostles, who were to beat down the devil's kingdom, must not attempt any thing till they received the promise of the Spirit; who came with a sound from heaven, as of a rushing, mighty wind, Ac 2:2.And let it be, when thou hearest the sound of a going in the tops of the mulberry trees,.... Of a going of the wind on the tops of these trees, making a rustling upon them, and that in such a manner as to resemble the going of men, or march of armies, as if they were moving in the air over the tops of the mulberry trees; which Jarchi and R. Isaiah interpret of angels being sent of God, and moving at that time to help David, and destroy the Philistines; so the Targum on 1 Chronicles 14:15. These trees being in Judea account for silk there, Ezekiel 16:10; though some think time was not known so early; others suppose it was, and to be the Hebrew byssus mentioned by Pausanias (a), as being of a yellow colour:

that then thou shall bestir thyself; or move towards the camp of the Philistines, and fall upon them in the rear, who, by reason of the sound in the trees, would not hear the motion of the Israelites; or, if they heard it, would take it to be no other than the motion of the trees they heard, both sounds being confounded together; or they would take the sound they heard for the motion of the enemy in the front, and give way, and so fall into the hands of the Israelites in their rear, which must throw them into the utmost confusion and consternation:

for then shall the Lord go out before thee to smite the host of the Philistines: by an angel or angels; so the Targum,"for then shall go forth the angel of the Lord, to make thee prosperous to slay in the camp of the Philistines;''

that being the precise time for the salvation of Israel, and the destruction of the Philistines, and the token of it.

(a) Eliac. sive, l. 5. p. 294.