Or HaChaim on Leviticus 20:22/אור החיים על ויקרא כ׳:כ״ב

1 ושמרתם את כל חקותי, "And you shall observe all My statutes, etc. The reason the Torah had to repeat this verse although we have read it already in 18,26 is to urge us to ensure that the statutes do not become abolished in practice through failure of either oneself or others to observe them. Observance of the statutes insures that the land will not spew you out. If the community one lives in fails to protest non-observance of these חוקים by others one will still be subject to the land spewing out its inhabitants even if personally one had been meticulous in one's observance of Torah law.