In مَالَهُ أَخْلَدَهُ, pronominal hāʾ follows a vowelled lām and is followed by hamzat al-qaṭʿ. In Ḥafṣ, that hamzah makes the linked hāʾ's extension ṣilah kubrā.
Contrast وَعَدَّدَهُ يَحْسَبُ, whose next letter is yāʾ and therefore has ṣilah ṣughrā. If you pause on mālahu, the cross-word major ṣilah does not occur. Always check the adjacent letters and whether the reading is connected.
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Mālahu akhladahu: major ṣilah
Al-Māʿūn and Al-Humazah: Applied Assimilation, Concealment, Madd and Hāʾ Rules
In مَالَهُ أَخْلَدَهُ, pronominal hāʾ follows a vowelled lām and is followed by hamzat al-qaṭʿ. In Ḥafṣ, that hamzah makes the linked hāʾ's extension ṣilah kubrā.
Contrast وَعَدَّدَهُ يَحْسَبُ, whose next letter is yāʾ and therefore has ṣilah ṣughrā. If you pause on mālahu, the cross-word major ṣilah does not occur. Always check the adjacent letters and whether the reading is connected.