וְֽאַל־תַּצֵּ֬ל מִפִּ֣י דְבַר־אֱמֶ֣ת עַד־מְאֹ֑ד כִּ֖י לְמִשְׁפָּטֶ֣ךָ יִחָֽלְתִּי׃
진리의 말씀이 내 입에서 조금도 떠나지 말게 하소서 내가 주의 규례를 바랐음이니이다
Rashi on Psalms
And do not take...from my mouth a word of truth Heb. תצל. Do not separate from my mouth a word of truth, as (Gen. 31:9): “And God separated (ויצל) your father’s property and gave it to me.” I found this.
Rashi on Psalms
utterly...a word of truth in all my instructions [regarding ritual law] and in all my legal decisions, that I should not stumble over them.