Tajweed RulesConverting the sakinah nun or tanwin into a concealed mim when it meets the letter ba, while observing the ghunnah for the duration of two harakahs; it has only one letter, which is ba.
مِنۢ بَعْدِ — أَنۢبِئْهُم — سَمِيعٌۢ بَصِيرٌSource:تحفة الأطفال

