Albert Barnes Commentary Psalms 119:137

"Righteous art thou, O Jehovah, And upright are thy judgments." — Psalms 119:137 (ASV)

Righteous are you, O Lord ... - This commences a new division of the psalm, indicated by the Hebrew letter Tsaddiy (צ ts) - corresponding with “ts.” The thought in this verse is that God is right, or righteous, in his judgments, that is, in his law; or, in other words, that his law is founded on principles of equity.