"He will say, 'You stayed but a little,'" meaning: your stay in the worldly life, despite its length, is insignificant compared to what you will stay in.
﴿قَالَ إِنْ لَبِثْتُمْ إِلا قَلِيلا﴾ أَيْ: إِنَّ لُبْثَكُمْ فِي الدُّنْيَا فِي طُولِ مَا أَنْتُمْ لَابِثُونَ فِي
