This document discusses several actions that could potentially invalidate one's salah or prayer, including speaking deliberately, unnecessary motions during prayer, having impurities on one's clothes, uncovering parts that should remain covered (awrah), intentionally eating or drinking during prayer, experiencing hadath before finishing the prayer, clearing one's throat, laughing, crying or groaning during prayer, changing one's intention during prayer, not facing the qiblah or turning away from it completely during prayer.