Qalb means conversion. When sākin nūn or tanwīn is followed immediately by bāʾ (ب), its n-sound is converted toward mīm and pronounced with ikhfāʾ plus ghunnah. This rule has one trigger letter: bāʾ.
The goal is not to insert a completely independent, strongly pronounced m. Learn the controlled nasal transition and lip positioning from accurate recitation.
The source specifically requires conversion to an m-like sound with concealed ghunnah, not a separate exposed mīm.
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Qalb: conversion before bāʾ
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
Qalb means conversion. When sākin nūn or tanwīn is followed immediately by bāʾ (ب), its n-sound is converted toward mīm and pronounced with ikhfāʾ plus ghunnah. This rule has one trigger letter: bāʾ.
The goal is not to insert a completely independent, strongly pronounced m. Learn the controlled nasal transition and lip positioning from accurate recitation.
The source specifically requires conversion to an m-like sound with concealed ghunnah, not a separate exposed mīm.