Charles Ellicott Commentary Deuteronomy 4:19

"and lest thou lift up thine eyes unto heaven, and when thou seest the sun and the moon and the stars, even all the host of heaven, thou be drawn away and worship them, and serve them, which Jehovah thy God hath allotted unto all the peoples under the whole heaven." — Deuteronomy 4:19 (ASV)

The sun, and the moon, and the stars. —The purest worship of antiquity—that which we find among the Persians—hardly escaped this snare.

Which the Lord thy God hath divided unto all nations. —The heavenly bodies could never be regarded as special protectors of any one nation. But Jehovah was pledged to be the God of Israel. This appears to be the argument of Deuteronomy 4:19-20.