Deuteronomy 32:18 - Matthew Poole's English Annotations on the Holy Bible

Of the Rock, i.e. of God, one of whose titles this is, above, Deuteronomy 32:4 Isaiah 44:8; or of Christ, who is called the Rock, 1 Corinthians 10:4, whom the Israelites are said to have tempted, there, Deuteronomy 32:9. That begat thee, i.e. who hath adopted you to be his people, and hath showed as much care and kindness to you as if he had begotten you.