Their feet - The quotation in this and the two following verses, is abridged or condensed from Isaiah 59:7-8. The expressions occur in the midst of a description of the character of the nation in the time of the prophet. The apostle has selected a few expressions out of many, rather making a reference to the entire passage, than a formal quotation. The expression, "their feet are swift," etc., denotes the eagerness of the nation to commit crime, particularly deeds of injustice and cruelty. They thirsted for the blood of innocence, and hasted to shed it, to gratify their malice, or to satisfy their vengeance.

Their feet are swift to shed blood - They make use of every means in their power to destroy the reputation and lives of the innocent.

Their feet are swift to shed blood. The sins of the heart and mouth are before described, and now the sins of action are taken notice of; for "the feet" are the instruments of motion and action: and when these are said to be "swift to shed blood", it denotes the readiness and eagerness of men, to murder innocent creatures; which shows the dreadful malice and hatred that is in them. The words are cited from Isaiah 59:7, and seem to point at the times of Manasseh, who shed so much innocent blood, as to fill Jerusalem with it from one end to the other.

Their feet are swift to shed blood-- (Proverbs 1:16; Isaiah 59:7): that is, "Those feet, which should 'run the way of God's commandments' (Psalm 119:32), are employed to conduct men to deeds of darkest crime."