Substituting a different Arabic letter is a clear example of lahn jali. For instance, ث and س are distinct letters, as are ح and ه, and ص and س.
ث → س: the original consonant has been replaced.
ح → ه: a different throat-related consonant is used.
ص → س: the original consonant is replaced with another one.
This is not merely an accent difference: the letter's identity has changed. Listening to an expert reciter and practicing the contrast is a practical way to correct it.
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Foundations of Tajweed, Recitation Errors and Opening Etiquette
Substituting a different Arabic letter is a clear example of lahn jali. For instance, ث and س are distinct letters, as are ح and ه, and ص and س.
ث → س: the original consonant has been replaced.
ح → ه: a different throat-related consonant is used.
ص → س: the original consonant is replaced with another one.
This is not merely an accent difference: the letter's identity has changed. Listening to an expert reciter and practicing the contrast is a practical way to correct it.