I will be to you, etc. From 2 Samuel 7:14, where the Septuagint and Hebrew agree. Paul says sons and daughters for son.

Almighty [π α ν τ ο κ ρ α τ ω ρ]. The word is peculiar to Revelation, occurring nowhere else in the New Testament. Here it is a quotation. Frequent in the Septuagint.

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Old Testament