Rashi on Leviticus 19:29/רש"י על ויקרא י״ט:כ״ט

1אל תחלל את בתך להזנותה DO NOT PROSTITUTE THY DAUGHTER TO CAUSE HER TO BE A HARLOT — Scripture speaks of one who gives his unmarried daughter away for illegitimate concubinage (cf. Sifra, Kedoshim, Chapter 7 2; Sanhedrin 76a).

2ולא תזנה הארץ LEST THE EARTH BECOME DISLOYAL TO YOU — If you do this the soil will become faithless to you in regard to the distribution of its fruits, producing them in other places and not in your land. Scripture uses this simile also in (Jeremiah 3:2—3) "and thou hast polluted thy land with thy whoredom… Therefore the showers have been withholden etc.” (so that the land yielded no fruit) (Sifra, Kedoshim, Chapter 7 4; Tosefta Kiddushin 1).