John Gill Commentary Psalms 26:9

"Gather not my soul with sinners, Nor my life with men of blood;" — Psalms 26:9 (ASV)

Gather not my soul with sinners
Profligate and abandoned ones, such as are notoriously profane, and who live and die impenitent ones; otherwise all men are sinners:

the sense is, either that he desires that he might not, by any means, be brought into the company of such persons, be joined unto them, and have a conversation with them, which would be uncomfortable, dishonourable, and dangerous; or that God would not destroy him with them; and that he might not die the death of the wicked, nor be gathered with them at death: death is often expressed by a man's being gathered to his people, and to his fathers; see (2 Kings 22:20) ; the body is gathered to the grave, the soul returns to God that gave it, and has its place assigned by him; the souls of the righteous are gathered into heaven, Christ's garner; the souls of the wicked into hell; the psalmist deprecates being gathered with them;

nor my life with bloody men ;
that thirst after blood, lie in wait for it, shed it, and are drunk with it, as the antichristian party; these God abhors and detests; nor shall they live out half their days, and their end is miserable.