Verse 3
If I have done this - David was accused by Saul of affecting the kingdom; and of waiting for an opportunity to take away the life of his king, his patron, and his friend. In his application to God he refers to these charges; meets them with indignation; and clears himself of them by a strong appeal to his Judge; and an imprecation that, if he had meditated or designed any such thing, he might meet with nothing but curse and calamity either from God or man.