Thou hast beset me behind and before - אחור וקדם צרתני achor vekodam tsartani, “The hereafter and the past, thou hast formed me.” I think Bishop Horsley’s emendation here is just, uniting the two verses together. “Behold thou, O Jehovah, knowest the whole, the hereafter and the past. Thou hast formed me, and laid thy hand upon me.”