Sukūn marks a consonant without a vowel; shaddah calls for a strengthened, doubled consonant. Omitting or adding either incorrectly can distort recitation.
A doubled consonant must be perceptibly doubled, not read as an ordinary single moving letter. A sākin letter must not be given an invented vowel. The author lists such changes among serious pronunciation errors.
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Preserving sukūn and shaddah
Why Tajwīd Matters: Foundations and Terminology
Sukūn marks a consonant without a vowel; shaddah calls for a strengthened, doubled consonant. Omitting or adding either incorrectly can distort recitation.
A doubled consonant must be perceptibly doubled, not read as an ordinary single moving letter. A sākin letter must not be given an invented vowel. The author lists such changes among serious pronunciation errors.