1)
Who made their tongues sharp?
1.
Radak: The Zifim and similar people who slandered David to Sha'ul.
2)
What is their arrow?
1.
Rashi: It is their Leshon ha'Ra.
2.
Radak: It is a bitter word (or matter).
3)
What is the meaning of "Darchu Chitzam"?
1.
Radak: They drew their bow (mouth) to shoot the arrow. This is like "Yidroch Chitzav" (58:8).
2.
Malbim: They anointed the arrow with poison.
4)
Why does the verse compare their tongues to a sword and an arrow?
1.
Malbim: A sword kills nearby; an arrow kills from afar. In front of me they speak arrogantly; covertly they slander me like an arrow that one shoots from afar.