Tajweed RulesIf, in a separate word, one of the letters of «يَنْمُو» (ya, nun, mim, waw) follows the sakinah nun or tanwin, the nun is merged (idgham) into it while the ghunnah is retained for the duration of two harakahs (counts).
مَن يَقُولُ — مِن وَالٍ — فَمَن يَعْمَلْSource:تحفة الأطفال

