Fatwa: Errors in pronunciation
--answered by Sayyid Allama Muhammad bin Abdul-Azeem al-Houthi
It does not invalidate it especially if it was done inadvertently and not deliberately. However, it is religiously obligatory for a person to learn the proper pronunciation, the Faatiha and another Surah. The proof for that is that our people have made the tasbeeh [i.e. saying "Subhan Allah wa alhamdulillah wa laa ilaaha ila Allah wa Allahu akbar"] a substitution for the Faatiha.