Midrasch zu Tehillim 119:1

Scripture states, concerning the reward that students of the Torah will receive after their deaths: And from old, men have not heard or perceived by ear, neither hath the eye seen a God beside Thee who worketh for him who waiteth for Him (Isa. 64:3). Furthermore, it states: Happy are they who are upright in the way, who walk in the law of the Lord (Ps. 119:1); that is to say, Happy are they who honor masters of the Torah. And it says also: It is a tree of life to them that lay hold upon her, and happy is everyone that holdeth her fast (Prov. 3:18).