When we call Allah "Al-Quddus," we're acknowledging His flawless and untainted nature. It reminds us that Allah is completely free from any imperfections, sins, or impurities.

So, whenever Muslims say "Al-Quddus," they're expressing reverence for Allah's divine purity and seeking His forgiveness and guidance. It's a reminder of Allah's absolute perfection and our aspiration to follow His example by leading a pure and righteous life.