Then God turned, and gave them up to worship the host of heaven; as it is written in the book of the prophets, O ye house of Israel, have ye offered to me slain beasts and sacrifices by the space of forty years in the wilderness? Then God turned, and gave them up, etc. - He left them to themselves, and then they deified and worshipped the sun, moon, planets, and principal stars.
In the book of the prophets - As this quotation is found in Amos, Amos 5:25, by the book of the prophets is meant the twelve minor prophets, which, in the ancient Jewish division of the sacred writings, formed only one book.
Have ye offered to me slain beasts - It is certain that the Israelites did offer various sacrifices to God, while in the wilderness; and it is as certain that they scarcely ever did it with an upright heart. They were idolatrous, either in heart or act, in almost all their religious services; these were therefore so very imperfect that they were counted for nothing in the sight of God; for this seems to be strongly implied in the question here asked, Have ye offered to Me (exclusively and with an upright heart) slain beasts and sacrifices by the space of forty years? On the contrary, these forty years were little else than a tissue of rebellion and idolatry.