Fatḥah, kasrah, and ḍammah are meaningful parts of Arabic pronunciation. Replacing one with another may alter the form of a Qur'anic word, even when the consonant itself has been pronounced from the correct point.
Correct recitation therefore includes the letter's vowel marking. Before reading, inspect the consonant, its vowel, and whether it has sukūn or shaddah.
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Why changing a vowel matters
Why Tajwīd Matters: Foundations and Terminology
Fatḥah, kasrah, and ḍammah are meaningful parts of Arabic pronunciation. Replacing one with another may alter the form of a Qur'anic word, even when the consonant itself has been pronounced from the correct point.
Correct recitation therefore includes the letter's vowel marking. Before reading, inspect the consonant, its vowel, and whether it has sukūn or shaddah.