Rashi on Psalms
Who will ascend upon the Lord’s mount Although all the inhabitants of the world are His, not everyone deserves to come near to Him, except these: he who has clean hands, etc.
Radak on Psalms
Who shall ascend into the hill of the Lord ? And who shall stand in His holy place ? – Because it is not fitting that every man should ascend it, seeing that it is a place of holiness and repentance.