Notice that the subject may be an attached pronoun or an explicit noun, but the object remains accusative.
Natural meaning
Arabic sentence
I read the Quran
قَرَأْتُ الْقُرْآنَ
The Muslims killed the disbelievers
قَتَلَ الْمُسْلِمُونَ الْكَافِرِينَ
We heard the Quran
سَمِعْنَا الْقُرْآنَ
The Muslim tore the paper
مَزَّقَ الْمُسْلِمُ الْوَرَقَةَ
Zaynab memorized the lesson
حَفِظَتْ زَيْنَبُ الدَّرْسَ