Ellicott's Commentary On The Whole Bible
Psalms 26 - Introduction
XXVI.
A priestly or Levitical psalm (see Psalms 26:6), calm and regular, composed of twelve verses, each verse a distich. The writer has nothing to reproach himself with; he can appeal to the strict tribunal of God without fear. The protest against apostasy is evidently made not for himself alone, but for the pious part of the community.