قَـٰلَ إِن لَّبِثْتُمْ إِلَّا قَلِيلًا ۖ لَّوْ أَنَّكُمْ كُنتُمْ تَعْلَمُونَ

Qala in labithtum illaqaleelan law annakum kuntum taAAlamoon

He will say, "You stayed not but a little - if only you had known.