In وَيْلٌ لِكُلِّ, tanwīn meets lām, exactly as in فَوَيْلٌ لِلْمُصَلِّينَ. Both give idghām without ghunnah.
The pair هُمَزَةٍ لُمَزَةٍ repeats the same rule in the same verse. The important skill is transferring a decision across different words by spotting the same letter sequence. At a pause on the first word, the cross-word rule no longer operates.
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Waylun li-kulli: transfer the rule
Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules
In وَيْلٌ لِكُلِّ, tanwīn meets lām, exactly as in فَوَيْلٌ لِلْمُصَلِّينَ. Both give idghām without ghunnah.
The pair هُمَزَةٍ لُمَزَةٍ repeats the same rule in the same verse. The important skill is transferring a decision across different words by spotting the same letter sequence. At a pause on the first word, the cross-word rule no longer operates.