Who shall ascend into the hill of the LORD?

Psalm 24:3-6

3   Who shall ascend into the hill of the LORD? or who shall stand in his holy place?
4   He that has clean hands and a pure heart, who has not lifted up his soul unto vanity, nor sworn deceitfully.
5   He shall receive the blessing from the LORD, and righteousness from the God of his salvation.
6   This is the generation of them that seek him, that seek your face, O Jacob.