Labial Idgham

Labial Idgham (Idgham of Identical Letters)

Letter of Labial Idgham: a single letter — Meem (m).

The silent Meem merges only into its identical counterpart, the letter Meem, so that the two Meems (the merged one and the one merged into) become a single doubled Meem with ghunnah. This is called Idgham Mutamathilayn (merging of identical letters).

This Idgham is "incomplete" because the ghunnah remains as a quality of the merged letter.

Examples of Labial Idgham (Idgham Mutamathilayn):

﴾الَّذِي أَطْعَمَهُم مِّن جُوعٍ وَٖامَنَهُم مِّنْ خَوْفٍ﴿ (Quraysh: 4)

﴾إِنَّهَا عَلَيْهِم مُّؤْصَدَةً﴿ (Al-Humazah: 8)

﴾وَاللَّهُ مِن وَرَائِهِم مِّحِيطً﴿ (Al-Buruj: 20)

Note: A doubled Meem resulting from separate causes (Iqlab of Noon, Idgham of Tanween) within the same word is not part of this Labial Idgham ruling — only the doubled Meem arising directly from a silent Meem meeting another Meem falls under it.