Reference for Exodus 23:35

Our Rabbis were taught: He who annoys a stranger transgresses three negative commandments, and he who oppresses him transgresses two. Let us see, Regarding annoying, there are three negative commandments, (Ex. 22, 20; Lev. 19, 33 and 25, 17). If so, then there are three negative commandments concerning oppression also (namely, Ex. 22, 20; 23, 9 and 22, 24) — which include also the stranger. We must therefore say that in both cases, he transgresses three negative commandments.

But is it not true that if they do the will of the Omnipresent, etc. Above in Parshas Mishpatim (Shmos 23:29) I explained why Rashi did not say this reason.