Before rāʾ (ر), apply idghām without ghunnah. The source example مِنْ رَبِّهِمْ places sākin nūn immediately before rāʾ. The separate n-sound merges into the rāʾ.
Both lām and rāʾ share the no-ghunnah category, but retain their own individual articulation. Idghām must not blur their identities.
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No-ghunnah idghām before rāʾ
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
Before rāʾ (ر), apply idghām without ghunnah. The source example مِنْ رَبِّهِمْ places sākin nūn immediately before rāʾ. The separate n-sound merges into the rāʾ.
Both lām and rāʾ share the no-ghunnah category, but retain their own individual articulation. Idghām must not blur their identities.