Charles Ellicott Commentary Psalms 41:2

"Jehovah will preserve him, and keep him alive, And he shall be blessed upon the earth; And deliver not thou him unto the will of his enemies." — Psalms 41:2 (ASV)

And he shall be blessed. —Not as in the margin of Isaiah 9:16, and in Symmachus “called happy,” but with deeper meaning, as in Proverbs 3:18. Another derivation is possible, giving the meaning, “he shall be led aright,” i.e., he will have right moral guidance. The context, however, does not favour this.

Upon the earth. —Rather, in the land, i.e., of Canaan.