In عِلْمَ الْيَقِينِ, the article lām is pronounced before yāʾ: lām qamariyyah. The «قِي» contains a madd yāʾ.
Stopping on «الْيَقِينِ» makes its final nūn sākin. Because that sukūn follows a madd letter, madd ʿāriḍ li-s-sukūn becomes relevant, with its permissible lengths.
Compare connected reading with stopping at the end of verse 5; the timing need not be identical.
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Lunar lām and pause on al-yaqīn
Al-ʿAṣr and At-Takāthur: Applied Ghunnah, Madd, Lām and Waqf
In عِلْمَ الْيَقِينِ, the article lām is pronounced before yāʾ: lām qamariyyah. The «قِي» contains a madd yāʾ.
Stopping on «الْيَقِينِ» makes its final nūn sākin. Because that sukūn follows a madd letter, madd ʿāriḍ li-s-sukūn becomes relevant, with its permissible lengths.
Compare connected reading with stopping at the end of verse 5; the timing need not be identical.