David
Psalm 24:4ESV·traditional attribution

He who has clean hands and a pure heart, who does not lift up his soul to what is false and does not swear deceitfully.

John Calvin Reformed @genevareformer

PSALM 24. As God stands related to all mankind as their Creator and Governor, David, from this consideration, magnifies the special favor which God manifested towards the children of Abraham, in choosing them to be his peculiar people, in preference to the rest of mankind, and in erecting his sanctuary as his house that he might dwell among them.

Commenting on Psalm 24:1-10

C.H. Spurgeon Reformed Baptist @princeofpreachers

Here we have the true Israel described. The men who shall stand as courtiers in the palace of the living God are not distinguished by race, but by character; they are not Jews only, nor Gentiles only, nor any one branch of mankind peculiarly, but a people purified and made meet to dwell in the holy hill of the Lord.

Commenting on Psalm 24:3

C.H. Spurgeon Reformed Baptist @princeofpreachers

"He that hath clean hands." Outward, practical holiness is a very precious mark of grace. To wash in water with Pilate is nothing, but to wash in innocency is all-important. It is to be feared that many professors have perverted the doctrine of justification by faith in such a way as to treat good works with contempt; if so, they will receive everlasting contempt at the last great day.