Is it obligatory to repeat a word in prayer – repeatedly – when exaggerating the pronunciation of a letter, such as making a sound by clashing the teeth when pronouncing the letters Ṣād or Sīn, knowing that it is sometimes pronounced correctly?

A person afflicted with obsessive doubts (waswas) should disregard them and pay them no mind, because succumbing to them leads to great evil. Regarding the pronunciation of letters and words, the person afflicted with waswas should pronounce the word only once and not repeat its pronunciation, no matter how much Satan whispers to him that his pronunciation is incorrect; by doing so, he will rid himself of the waswas.