flying roll
A "roll," in Scripture symbolism, means the written word whether of God or man (Ezekiel 6:2); (Jeremiah 36:2); (Jeremiah 36:4); (Jeremiah 36:6); etc: (Ezekiel 3:1-3). Zechariah's eighth vision is of the rebuke of sin by the word of God.
The two sins mentioned really transgress both tables of the law. To steal is to set aside our neighbor's right; to swear is to set aside God's claim to reverence. As always the law can only curse (Zechariah 5:3); (Galatians 3:10-14).