Proverbs 1:16 is the direct source of 'feet swift to shed blood' — Paul quotes it to show universal sin.

Isaiah 59:7 is the primary source of 'feet swift to shed blood' — Paul quotes this passage directly.

Isaiah 59:8 continues the quote — 'the way of peace they do not know' — completing Paul's description.

In Esther 3:13, Haman decrees the swift annihilation of all Jews — a clear example of readiness to shed blood.

In Esther 5:14, Haman rushes to build a gallows for Mordecai — swift murder plot.

In Psalm 59:4, David's enemies 'run and make ready' against him — swift to attack without cause.

In Jeremiah 41:7, Ishmael slaughters the pilgrims after luring them — swift, deceptive bloodshed.

Mark 6:25 reveals Herodias's demand for John the Baptist's head — a narrative example of swiftness to shed blood.

John 13:30 shows Judas leaving at once to betray Jesus — his feet were swift to shed blood.

Proverbs 6:18 also describes feet hastening to evil — a parallel image of eager sinning.