What happens when joining «فَوَيْلٌ لِلْمُصَلِّينَ»?

Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules

• Ikhfāʾ shafawī
• Iqlāb
• Idghām with ghunnah
• Idghām without ghunnah