C. F. Keil and Franz Delitzsch on Hosea 13:6

Hos 13:6

But prosperity made Israel proud, so that it forgot its God. Hos 13:6. “As they had their pasture, they became full; they became full, and their heart was lifted up: therefore have they forgotten me.” This reproof is taken almost word for word from Deu 8:11. (cf. Deu 31:20; Deu 32:15.). כּמרעיתם, answering to their pasture, i.e., because they had such good pasture in the land given them by the Lord. The very thing of which Moses warned the people in Deu 8:11 has come to pass. Therefore are the threats of the law against the rebellious fulfilled upon them.