Matthew Henry on 1 Samuel 26:1-5
Here, 1. Saul gets information of David's movements and acts offensively. The Ziphites came to him and told him where David now was, in the same place where he was when they formerly betrayed him, Sa1 23:19. Perhaps (though it is not mentioned) Saul had given them intimation, under-hand, that he continued his design against David, and would be glad of their assistance. If not, they were very officious to Saul, aware of what would please him, and very malicious against David, to whom they despaired of ever reconciling themselves, and therefore they stirred up Saul (who needed no such spur) against him, Sa1 26:1. For aught we know, Saul would have continued in the same good mind that he was in…
Read the whole note in the consoleJamieson-Fausset-Brown on 1 Samuel 26:4
David . . . sent out spies . . . and David arose, and came to the place where Saul had pitched--Having obtained certain information of the locality, he seems, accompanied by his nephew (Sa1 26:6), to have hid himself, perhaps disguised, in a neighboring wood, or hill, on the skirts of the royal camp towards night, and waited to approach it under covert of the darkness.
Adam Clarke on 1 Samuel 26:2
Three thousand chosen men - Though they knew that David was but six hundred strong, yet Saul thought it was not safe to pursue such an able general with a less force than that mentioned in the text; and, that he might the better depend on them, they were all elect or picked men out of the whole of his army.
John Gill on 1 Samuel 26:4
David therefore sent out spies,.... To observe if he was coming or come, and where he was, that he might not be surprised by him; for though David knew the Lord was and would be his protection, he thought proper to be upon his guard, and to make use of means for his safety:
and understood that Saul was come in very deed; that he was most certainly come, and come to some certain place; which he himself went to reconnoitre, as in 1 Samuel 26:5.