The Quran

أَلا إِنَّ لِلَّهِ ما فِي السَّماواتِ وَالأَرضِ ۖ قَد يَعلَمُ ما أَنتُم عَلَيهِ وَيَومَ يُرجَعونَ إِلَيهِ فَيُنَبِّئُهُم بِما عَمِلوا ۗ وَاللَّهُ بِكُلِّ شَيءٍ عَليمٌ

(Saheeh International)

Unquestionably, to Allāh belongs whatever is in the heavens and earth. Already He knows that upon which you [stand]¹ and [knows] the Day² when they will be returned to Him and He will inform them of what they have done. And Allāh is Knowing of all things.

i.e., your position – the basis for your actions (whether sincere faith or hypocrisy) and the condition of your souls.
The meaning can also be rendered "…and [let them beware of] the Day…"