Verse 13. "They sacrifice flesh" - Bp. Newcome translates thus: "They sacrifice gifts appointed unto me, and eat flesh." They offer to their idols the things which belong to Jehovah; or, while pretending to offer unto the Lord, they eat and drink idolatrously; and therefore the Lord will not accept them.
"They shall return to Egypt." - Many of them did return to Egypt after the conquest of Palestine by Shalmaneser, and many after the ruin of Jerusalem by Nebuchadnezzar; but they had in effect returned to Egypt by setting up the worship of the golden calves, which were in imitation of the Egyptian Apis.
Verse 14. "Israel hath forgotten his Maker" - And therefore built temples to other gods. Judah had lost all confidence in the Divine protection, and therefore built many fenced cities. But the fire of God's anger burnt up both the temples and the fortified cities.