1)
What is "Tzidki"?
1.
Radak: It is my straightness, and what is proper for me.
2)
Why did they say "Yigdal Hashem"?
1.
Malbim: Since Hashem guards his servants and gives to them Shalom, His name is aggrandized in the world.
3)
Who is "Avdo"?
1.
Radak: It is David - Hashem wanted his Shalom, and saved him from his haters.
