"And they came to their father at night, weeping." Muhammad [ibn Abi Zamanin] said: "'Isha'an' (at night) is in the accusative case as a temporal adverbial expression."
Arabic (Source)
﴿وَجَاءُوا أباهم عشَاء يَبْكُونَ﴾ قَالَ محمدٌ: (عشَاء) مَنْصُوب على الظّرْف.
