وَإِنْ كَانَ آخِرُ الِاسْمِ أَلِفًا، ثَبَتَتْ، كَـ«عَصَايَ وَرَحَايَ»، خِلَافًا لِلْهُذَيْلِ، كَـ«عَصِيَّ وَرَحِيَّ».
Translation: If the noun ends in alif, that alif remains, as in ʿaṣāya and raḥāya, unlike the dialect of Hudhayl, which has forms such as ʿaṣiyya and raḥiyya.
This is the treatment of a maqṣūr noun. The final alif in ʿaṣā/raḥā remains in the normal construction with possessive yāʾ.