Augustine of Hippo

But they of whose iniquities this Psalm speaks, when they had entered into that temporal land of promise, "destroyed not the heathen, which the Lord commanded them" [Psalm 106:34]; "but were mingled among the heathen, and learned their works" [Psalm 106:35]. "Insomuch that they worshipped their idols, which became to them an offense" [Psalm 106:36]. Their not destroying them, but mingling with them, became to them an offense.