From the teachings of the Ben Ish Chai
Anyone who speaks lashon hara - afflictions come upon him. [Arachin 15b]
A lashon hara speaker changes the order of letters. By causing a falling out between friends, he turns לשׁון - "tongue" into נשׁול - "fall".
By ruining a precious vessel - "the lips of knowledge are a precious vessel" [Proverbs 20:15] - he turns יקר "precious" into קרי - "impurity".
Measure for measure, ענג - oneg -"delight" will turn into נגע - nogah - "affliction" - and afflictions will come upon him.