What does 1 Samuel 29:3 mean?

The Philistine commanders asked, 'What are these Hebrews doing here?' Achish replied, 'That’s David, the servant of Saul, king of Israel. He’s been with me for a long time, and I’ve never found anything wrong with him from the day he came until now.' 1 Samuel 29:3 - Modern Text Bible

(The Philistine leaders are suspicious of David’s presence, but Achish defends him, trusting his loyalty.)