وَإِذَا أَرَدْتَ تَأْكِيدَ الضَّمِيرِ الْمَرْفُوعِ الْمُتَّصِلِ بِالنَّفْسِ وَالْعَيْنِ، يَجِبُ تَأْكِيدُهُ بِالضَّمِيرِ الْمُنْفَصِلِ، نَحْوُ: «ضَرَبْتَ أَنْتَ نَفْسُكَ».
Translation: When emphasizing an attached nominative subject pronoun with nafs or ʿayn, the book requires an intervening detached pronoun, as in “You yourself struck.”
The scanned example lacks full vowel marks. The nominative, nafsuka, is shown for subject emphasis; the accusative, nafsaka, instead functions as “yourself” as object.