Midrasz do Kapłańska 18:1

1) (Vayikra 18:1) "And the L–rd said to Moses, saying: (Vayikra 18:2) Speak to the children of Israel and say to them: I am the L–rd your G d." I am the L–rd who spoke and caused the world to come into being. I am full of mercy. I am a Judge, who exacts payment, and who is trusted to reward.

Another interpretation (of Prov. 6:22): WHEN YOU WALK, IT WILL GUIDE YOU, < i.e., > when someone labors at Torah during his life.³Cf. Avot 6:9; Sifra to Lev. 18:1 (pereq 13); Sifre to Deut. 6:7 (34); Sot. 21a; also Gen. R. 35:3 (but not in the Theodor/Albeck edition); M.Pss. 1:11; 119:7, 10 (2), 49 (41); 140:1. (Ibid., cont.:) IN YOUR LYING DOWN, IT WILL WATCH OVER (rt.: ShMR) YOU, [because it keeps (rt.: ShMR) him] from worm and maggot. (Ibid., cont.:) AND WHEN YOU AWAKEN, IT WILL CONVERSE WITH YOU. In the future life, when everyone shall stand in judgment, it is one's advocate⁴Gk.: synegoros. and pleads his cause.

2) It is I, who exacted payment from the generation of the flood, and from the people of Sodom, and from the Egyptians, and I am destined to exact payment from you if you follow in their ways.