Rashi, on Ps 18:12

“For thy servant keepeth them, and in keeping them there is a great reward.”

“for in observing them there is great reward I was careful in its observance because of Your great good that You have hidden away, and according to this usage, עקב is like (Gen. 26:5): “because (עקב) Abraham hearkened to My voice.” Another explanation of עקב רב: The end of the Torah scholars is that they will come to greatness. עקב is an expression of the end, and there is a similar expression in the language of the Mishnah (Sotah 9:15): “At the end (בעקבות) of the exile, prior to the coming of the Messiah.””

Imported from an open dataset — not yet checked against the printed edition.