Rashi on Deuteronomy 16:22/רש"י על דברים ט״ז:כ״ב

1ולא תקים לך מצבה NEITHER SHALT THOU RAISE ANY MONUMENT — i.e. a monument of one stone (cf. Rashi on Deuteronomy 12:3), not even in order to sacrifice on it to Heaven (to God).

2אשר שנא WHICH [THE LORD THY GOD] HATETH — An altar of stones and an altar of earth He has commanded you to make; this, however, He hates, because it was a religious ordinance amongst the Canaanites. And although it was pleasing to Him in the days of our Patriarchs (cf. Genesis 28:18), now He hates it because these (Canaanites) made it an ordinance of an idolatrous character (cf. Sifrei Devarim 146).