Idgham Mutamathilayn

This section and the two that follow it cover Minor Idgham in its three types: Mutamathilayn, Mutaqaribayn, and Mutajanisayn — the merging of a silent letter with a voweled one, so that they become a single doubled letter of the same kind as the second.

For Idgham Mutamathilayn, Hafs merges every pair of identical letters that meet where the first is silent, such as:

Taa before Taa: ﴾فَمَا رَبِحَت تِّجَارَتُهُمْ﴿ (Al-Baqarah: 16)

Daal before Daal: ﴾وَقَد دَّخَلُٰا بِالْكُفْرِ﴿ (Al-Ma'idah: 61)

Dhaal before Dhaal: ﴾وَذَا النُّونِ إِذ ذَّهَبَ مُغَاضِبًا﴿ (Al-Anbiya: 87)

Kaaf before Kaaf: ﴾أَيْنَمَا تَكُونُواْ يُدْرِككُمُ الْمَوْتُ﴿ (An-Nisa': 78)

Lam before Lam: ﴾قُل لاّ أَشْهَدُ﴿ (Al-An'am: 19)

Faa before Faa: ﴾فَلاَ يُسْرِف فَِّي الْقَتْلِ إِنَّهُ كَانَ مَنْصُورًا﴿ (Al-Isra: 33)

Baa before Baa: ﴾اذْهَب بَِّكِتَابِي هَذَا﴿ (An-Naml: 28)

Meem before Meem: ﴾قَدْ جَاءَتْكُم مَّوْعِظَةً مِّن رَّبِّكُمْ﴿ (Yunus: 57)

Noon before Noon: ﴾لَن نَّصْبِرَ عَلَىَ طَعَامٍ وَاحِدٍ﴿ (Al-Baqarah: 61)

Waw (silent, preceded by fatha) before Waw: ﴾حَتَّى عَفَواْ وَّقَالُواْ﴿ (Al-A'raf: 95)

There is no Idgham if the first of the two identical letters is a Madd letter, such as:

﴾الَّذِينَ ٖامَنُواْ وَعَمِلُواْ الصَّالِحَاتِ طُوبَى لَهُمْ وَحُسْنُ مَٖابٍ﴿ (Ar-Ra'd: 29)

﴾هُوَ الَّذِي يُرِيكُمُ الْبَرْقَ خَوْفًا وَطَمَعًا﴿ (Ar-Ra'd: 12)

Hafs has two valid ways of reciting ﴾مَا أَغْنَى عَنِّي مَالِيَهْ * هَلَكَ عَنِّي سُلطَانِيهْ﴿ (Al-Haqqah: 28–29) when continuing recitation: As-Sakt (a brief pause) with Idhar, or Idgham.