Ar-Rad 15

Allah affirms His might and power, for He has full control over everything, and everything is subservient to Him. Therefore, everything, including the believers, prostrate to Allah willingly, while the disbelievers do so unwillingly,

and so do their shadows in the mornings

in the beginning of the days,

and in the afternoons

towards the end of the days. Allah said in another Ayah,

Have they not observed things that Allah has created: (how) their shadows incline. An-Nahl 48