The book describes jahr in terms of strength and firmness, opposing it to hams. In articulation, a jahr letter does not let breath escape in the same unrestricted way as a hams letter.
Jahr does not instruct a reader to shout. The point is to preserve the consonant’s intrinsic quality while reciting at a measured volume. The easiest way to classify the group is to memorize the ten hams letters and recognize that the others have jahr.
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Jahr: firm voice production
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
The book describes jahr in terms of strength and firmness, opposing it to hams. In articulation, a jahr letter does not let breath escape in the same unrestricted way as a hams letter.
Jahr does not instruct a reader to shout. The point is to preserve the consonant’s intrinsic quality while reciting at a measured volume. The easiest way to classify the group is to memorize the ten hams letters and recognize that the others have jahr.