John Gill

Blessed is the man that doth this,.... That does justice, and keeps judgment; he hereby exercises a good conscience both towards God and men; he enjoys communion with God in his ways, worship, and ordinances, he attends unto, and has an evidence of his right to eternal happiness: and the son of man that layeth hold on it; on the salvation of Christ, and his righteousness; which supposes a sense of the insufficiency of a man's own righteousness, a view of the excellency and suitableness of Christ's righteousness; and is expressive of a strong act of faith upon it, embracing and retaining it as a man's own: that keepeth the sabbath from polluting it; by doing any servile work on it, and attending to all religious duties, private or public. This is put for the whole of instituted worship under the Gospel dispensation, and for any day or time in which the church of Christ meet together for religious worship: and keepeth his hand from doing any evil; committing any sin against God, or doing injury to the persons or properties of men, including the whole of moral duty.