It might seem a bold adventure; but,
1. He thought himself forced to it by Saul's inveterate rage, and continued resolutions to persecute him.
2. It is probable he had sent some persons to treat with him, and had agreed upon conditions, and received assurance of his safe and peaceable abode with him.
3. David reasonably thought that Achish would gladly receive him, as indeed he did; partly, because he saw Saul's implacable enmity against him; partly, because by this means he should be freed from the most formidable enemy which he had in all Israel, who might do him most mischief in the battle; which it seems at this time he designed; and partly, because he came not now alone, as he did before, but brought with him sufficient pledges of his fidelity to Achish; namely, all his soldiers, and his and their wives, 1 Samuel 27:3.