Al-Muthaalan — Merging Same Letters

tajweed Level: intermediate assimilation tj-032

Muthaalan: Two identical letters (same makhraj and sifaat), first sakinah, second moving.

Types:
• Sagheer (small): first sakinah — obligatory Idgham: "اذهَبْ بِّكِتَابِي"
• Kabeer (large): both moving — Idgham in some readings

Hafs examples: "قَدْ دَخَلُوا" (Dal+Dal), "لَكُم مَّا" (Meem+Meem)

Source: Matn Al-Jazariyyah by Ibn Al-Jazari

Question: What is the difference between Sagheer and Kabeer Muthaalan?

Answer: Sagheer: first is sakinah. Kabeer: both are moving