Surah Al-Mu'minun, Verse 114

قَٰلَ إِن لَّبِثۡتُمۡ إِلَّا قَلِيلٗاۖ لَّوۡ أَنَّكُمۡ كُنتُمۡ تَعۡلَمُونَ١١٤

qāla in labith'tum illā qalīlan law annakum kuntum taʿlamūna

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