Sh'mu'el Alef (1 Sa) 21:12-13

The servants of Akhish said to him, “Isn’t this David, king of the land? Weren’t they dancing and singing to each other, ‘Sha’ul has killed his thousands, but David his tens of thousands’?” These remarks were not lost on David, and he became very much afraid of Akhish king of Gat.