'Psalms' in the Bible

For David himself says in the book of Psalms,‘The Lord (the Father) said to my Lord (the Son, the Messiah),“Sit at My right hand,

Then He said to them, “This is what I told you while I was still with you, everything which has been written about Me in the Law of Moses and the [writings of the] Prophets and the Psalms must be fulfilled.”