Psalms 41:2-3

It is possible to render as in P.B.V. and R.V. marg., The Lord perserve him … the Lord support him:but it is more natural to regard these clauses as descriptive of the blessings which await the compassionate man, rather than as a prayer on his behalf.

he shall be blessed upon the earth He shall be made prosperous, or more probably, counted happy (Job 29:11; Psalms 72:17), in the land. Cp. Psalms 37:3 ff.

and thou wilt not deliver him Rather, as R.V., and deliver not thou him. Cp. Psalms 27:12. The language of promise passes into that of prayer, doubtless with a tacit reference to the Psalmist's own need.