"To the chief Musician, [even] to (a) Jeduthun, A Psalm of David." I said, (b) I will take heed to my ways, that I sin not with my tongue: I will keep my mouth with a bridle, while the wicked is before me.
(a) This was one of the chief singers, (1 Chronicles 16:41).
(b) Although he had appointed with himself patiently to have wait for God's timing, yet the vehemency of his pain caused him to break his purpose.