What is "mi'Se'eso"?
Rashi: You fear people - perhaps [David] will reign and pay [what is proper for] your deeds, you counseled to do evil to him.
Radak: From His greatness and His exaltedness. "His" refers to "Elokim" and "Tzuri" mentioned above (verses 2, 3).
Malbim: They say that they push the fence on David due to the highness of Sha'ul and fear of him. He is the wall that topples the fence (refer to 62:4:2:2).
What is "Ya'atzu Lehadi'ach"?
Rashi: Refer to 62:5:1:1.
Radak: You counsel each other to cast off from Hashem's exaltedness and not turn to Him. They do not think that Hashem knows their thoughts.
Why does it say "Yirtzu Chazav"?
Radak: They speak unlike what is in their hearts, for they think that no one knows their hearts.
Malbim: Their claim [that they act due to fear of Sha'ul] is false. They want to kill me! They speak to me like lovers, and inside they curse me!
Why does it say "b'Fiv" (singular) and "b'Kirbam" (plural)?
Rashi: Each one blesses with his mouth.
Radak: The singular applies to each individual, and the plural to the Rabim bi'Chlal 1 . Verses often do so.
Everywhere else, Radak says oppositely - the singular applies to the Klal, and the plural to the individuals (e.g. Yeshayah 15:3)! Perhaps there is a printing mistake here. (PF)
What is "b'Kirbam"?
Rashi: It is in their thoughts.
