The meaning of Rock in the Bible
(From Easton's Bible Dictionary)

(Heb. tsur), employed as a symbol of God in the Old Testament (I Samuel 2:2; 2Sam 22:3; Isaiah 17:10; Psalms 28:1; 31:2,3; 89:26; 95:1); also in the New Testament (Matthew 16:18; Romans 9:33; I Corinthians 10:4). In Daniel 2:45 the Chaldaic form of the Hebrew word is translated "mountain." It ought to be translated "rock," as in Habakkuk 1:12 in the Revised Version. The "rock" from which the stone is cut there signifies the divine origin of Christ. (See STONE .)

See more on the meaning of Rock in the Bible:
Rock {International Standard Bible Encyclopedia}

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