Be you mindful always of his covenant; the word which he commanded to a thousand generations;
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Eusebius of Caesarea
As it has been supposed by some that the book of Psalms merely consists of hymns to God and sacred songs and that we shall look in vain in it for predictions and prophecies of the future, let us realize distinctly that it contains many prophecies, far too many to be quoted now, and it must suffice for proof of what Isaiah to make use of two psalms ascribed to Asaph, written in the time of David. For Asaph was one of the temple musicians then, as is stated in the book of Chronicles, and was inspired by the divine Spirit to speak the psalms inscribed with his name. - "Proof of the Gospel 10.1"