The final two verses are nearly parallel, but replace خَيْرًا with شَرًّا, changing the rule for the preceding tanwīn.
ذَرَّةٍ خَيْرًا — khāʾ is a throat letter: iẓhār.
ذَرَّةٍ شَرًّا — shīn is an ikhfāʾ letter: ikhfāʾ with ghunnah.
The student should produce a different audible articulation, not merely name the classifications.
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Iẓhār versus ikhfāʾ on parallel phrases
Al-Qāriʿah and Az-Zalzalah — Comparative Tajwīd Practice
The final two verses are nearly parallel, but replace خَيْرًا with شَرًّا, changing the rule for the preceding tanwīn.
ذَرَّةٍ خَيْرًا — khāʾ is a throat letter: iẓhār.
ذَرَّةٍ شَرًّا — shīn is an ikhfāʾ letter: ikhfāʾ with ghunnah.
The student should produce a different audible articulation, not merely name the classifications.