﴿ قُل لَّا يَعْلَمُ مَن فِى ٱلسَّمَٰوَٰتِ وَٱلْأَرْضِ ٱلْغَيْبَ إِلَّا ٱللَّهُ ۚ وَمَا يَشْعُرُونَ أَيَّانَ يُبْعَثُونَ ﴾

“Say: “None in the heavens or on earth knows the hidden reality [of anything that exists: none knows it] save God.” And neither can they [who are living] perceive when they shall be raised from the dead:”

Please check ayah 27:66 for complete tafsir.