The source includes junctions like قُلْ رَبِّ and بَلْ رَفَعَهُ, with lām assimilating into a following rāʾ during connection.
That does not mean every lām assimilates before every consonant. The book names قُلْنَا as a case in which lām is not assimilated into nūn. Apply the actual rule for the pair.
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Lām at assimilation junctions
Idghām: Types, Complete/Incomplete Assimilation and the Definite Article
The source includes junctions like قُلْ رَبِّ and بَلْ رَفَعَهُ, with lām assimilating into a following rāʾ during connection.
That does not mean every lām assimilates before every consonant. The book names قُلْنَا as a case in which lām is not assimilated into nūn. Apply the actual rule for the pair.