I will wash mine hands in innocency: so will I compass thine altar, O LORD:
Ver. 6. I will wash mine hands in innocency] As Exodus 40:32 1 Timothy 2:8; see Deu 21:6 Isaiah 1:15 James 5:8. If in our addresses to God we cannot wash our hands in innocency, yet we must wash them in tears: Quem poenitet peccasse, pens est innocens, saith Seneca, Penitence is well nigh as good as innocence; but one way or other be sure to come clean when you come to God's altar, when you draw nigh to him in holy duties. We wash our hands every day, and often, but when we are to sit with some great person we scour them with balls. Sic Egyptii sacerdotes apud Herod. in Euterpe, terrio quoque die corpus eradunt, &c.; so here, we must be always holy, but especially when we present ourselves to the holy eyes of our Creator. And hereby David differenciates himself from the wicked in the use of ordinances, wherein they were as forward as the best (Doeg may set his foot as far into the sanctuary as David, and cry, The temple of the Lord, &c.), but cared not to come clear thereunto; their hands were full of blood, their hearts full of wickedness.
So will I compass thine altar, O Lord] i.e. I will cover it with sacrifices and oblations, and perform what is required of me diligently and cheerfully. The people might not touch the altar, but only see afar off what was done there by the priests. Howbeit, those that were more zealous among them, to the end that they might have a full view of the services, stood not still in one place, but stirred up and down on all sides of the altar; and some such thing David did when he is said to have danced before the Lord, 2 Samuel 6:14 .