Mim merges into mim + nasalisation.
A silent mim ( مْ ) meeting another mim ( م ) merges into a single doubled mim, accompanied by a nasal hum of about 2 counts.
Hold the lips in the 'm' position while humming, then release into the letter that follows.
Also called idgham mutamāthilain (two identical letters).
aṭ'amahum min jū'
"Who has fed them, [saving them] from hunger and made them safe, [saving them] from fear."
fī qulūbihim maraḍ
"In their hearts is disease, so Allāh has increased their disease; and for them is a painful punishment because they [habitually] used to lie."
Mim merges into mim + nasalisation. A silent mim ( مْ ) meeting another mim ( م ) merges into a single doubled mim, accompanied by a nasal hum of about 2 counts.
Hold the lips in the 'm' position while humming, then release into the letter that follows.
One example is in Surah Quraysh 106:4: "أَطْعَمَهُم مِّن جُوعٍ" (aṭ'amahum min jū') — "Who has fed them, [saving them] from hunger and made them safe, [saving them] from fear.".