David began by lamenting his situation: enemies surrounded him. His threefold complaint is synthetic parallelism. In synthetic parallelism, the parts of a statement complement one another to create a harmonious desired effect. Here it seemed to David that everyone was against him. As David grew older, people in Israel increasingly turned away from him, believing that God had abandoned him. Absalom had won the hearts and support of many in the kingdom ( 2 Samuel 15:6). "Deliverance" is literally "salvation" (Heb. yeshua) and appears about136 times in Psalm. Most references to "deliverance" or "salvation" in the Old Testament have physical deliverance from some bad situation in view, rather than spiritual deliverance to eternal life. [source][source][source]
The word "Selah," which occurs71times in the Psalm , was probably a musical notation. Israel"s leaders may have added it sometime after David wrote the psalm when they incorporated it into public worship. It evidently indicated when the worshippers were to "lift up" their voices or their hands, since "Selah" seems to come from the Hebrew word salah, meaning "to lift up" or "to elevate."[source]