Musar על סוטה 69:19

David, because he referred to the words of Torah as "songs", was punished by the calamity of Uza and his joy was muted (Sotah 35a).

We also find that the spies, because of the sin of lashon hara, died an unnatural death, as it is written (Sotah 35a) (Bamidbar 14:37): "And they died, the men who had uttered an evil report of the land, etc." R. Shimon b. Lakish said: "They died an unnatural death." And it is stated there in the Gemara: "We are hereby taught that their tongues descended to their navels, and worms left their mouths onto their tongues, and from their tongues they descended to their navels."