Who is called "Chasidecha"?
Radak: It is one who is on the straight path, of life.
Radak citing Shocher Tov: It is one who hears someone curse him, and he is silent.
Malbim: It is one who conducted with Chasidus; he did not follow lust.
Where will his body and Nefesh go?
Radak: The body will descend to She'ol, but not the Nefesh. Rather, You will stand up the Nefesh to Your honor.
Malbim: My body will have serenity, health and length of days. In its proper time, it must die and go to s4o (the grave). My spiritual Nefesh will not descend; it will be forever in bliss - "va'Yagel Kevodi" (verse 9).
Is there a difference between s4o and Shachas?
Radak: No. The matter is repeated in different words.