I have sworn, and I will perform [it], that I will keep thy righteous judgments.
Ver. 106. I have sworn, and I will perform it] A religious vow is nothing else but a solemn promise, or rather oath made to God to use this or that means, either to avoid some evil whereunto he findeth himself inclined, or to be set onwards in the performance of some duty unto which he finds himself very backward, Masora sepes legi, decimae divitiis, vota sanctimoniae, silentium sapientiae (Pirke Aboth). Thus, Nehemiah 10:1, they take a new oath, and seal to it. Thus Job, Job 31:1, and Jacob, Genesis 28:21,22, called, therefore, the father of vows.
That I will keep thy righteous judgments] Keep them as I am able, and as thou by thy grace shalt enable me, Psalms 119:32. Peter was too peremptory, Jephthah too hasty.