Ṣafīr belongs to ص ز س. The book identifies a distinctive sharp, whistle-like quality. These letters share ṣafīr but differ in other properties: ṣād has istiʿlāʾ and iṭbāq, while sīn has istifāl and infitāḥ.
Practise صَ، زَ، سَ separately. Ṣafīr does not make them interchangeable, and no artificial high-pitched whistle should be added. Retain each consonant's whole set of qualities.
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Ṣafīr of ṣād, zāy and sīn
Ṣifāt al-Ḥurūf — Opposing Qualities and Strength Grades
Ṣafīr belongs to ص ز س. The book identifies a distinctive sharp, whistle-like quality. These letters share ṣafīr but differ in other properties: ṣād has istiʿlāʾ and iṭbāq, while sīn has istifāl and infitāḥ.
Practise صَ، زَ، سَ separately. Ṣafīr does not make them interchangeable, and no artificial high-pitched whistle should be added. Retain each consonant's whole set of qualities.