In مِنْ بَعْدِ, written nūn sākinah precedes bāʾ. In صُمٌّ بُكْمٌ, the tanwīn precedes bāʾ. The book gives both as examples of qalb.
The written forms differ, but the next letter and thus the rule remain the same. Practice the nasal transition into a clearly articulated b.
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The source’s qalb examples
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
In مِنْ بَعْدِ, written nūn sākinah precedes bāʾ. In صُمٌّ بُكْمٌ, the tanwīn precedes bāʾ. The book gives both as examples of qalb.
The written forms differ, but the next letter and thus the rule remain the same. Practice the nasal transition into a clearly articulated b.