Ezekiel 20:28

For when I had brought them into the land, for the which I lifted up Mine hand to give it to them, promising it to them by a solemn oath, then they saw every high hill and all the thick trees, places which were commonly devoted to idolatrous worship by the heathen, and they offered there their sacrifices, and there they presented the provocation of their offering, for their sacrifices continually provoked the Lord to anger, since they were made contrary to His command and will; there also they made their sweet savor, said here of all burnt offerings, and poured out there their drink-offerings, thus including all bloody and unbloody sacrifices in their heathenish worship. This was the principal transgression of the entire people of Israel after they had reached the Land of Promise.