Sura Ṭā Hā 20:15

إِنَّ ٱلسَّاعَةَ ءَاتِيَةٌ أَكَادُ أُخْفِيهَا لِتُجْزَىٰ كُلُّ نَفْسٍۭ بِمَا تَسْعَىٰ

inna l-sāʿata ātiyatun akādu ukhfīhā li-tujzā kullu nafsin bi-mā tasʿa

"Verily the Hour is coming - My design is to keep it hidden - for every soul to receive its reward by the measure of its Endeavour.