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.
Translation: Saheeh International (English)
1 i.e., your position - the basis for your actions (whether sincere faith or hypocrisy) and the condition of your souls.
2 The meaning can also be rendered "...and [let them beware of] the Day..."
فَيُنَبِّئُهُمthen He will inform themfayunabbi-uhum
بِمَاof whatbimā
عَمِلُواْۗthey didʿamilū
وَٱللَّهُAnd Allahwal-lahu
بِكُلِّof everybikulli
شَيۡءٍthingshayin
عَلِيمُۢ(is) All-Knowerʿalīmun
Tafsir
Know well that to Allah belongs everything in the heavens and on earth: in terms of being His creation, under His supreme authority and His control. O people! He knows whatever conditions you are in; nothing is hidden from Him, and on the Day of Judgment when you return to Him after resurrection, He will inform you of all the deeds you did in the world. Allah knows everything, nothing in the heavens or the earth is hidden from Him.