The Book of Psalms is canonical in Judaism (Ketuvim) and Christianity (Old Testament), with its authority confirmed by ancient manuscripts (Qumran), the New Testament, and councils (Hippo, Carthage). The Ethiopian Orthodox Tewahedo Church, however, has a broader canon that includes Psalm 151 as an integral part of the Psalter, accepted as Holy Scripture also by Orthodox, Syriac, and Armenian traditions, demonstrating the historical diversity of biblical canons.
Psalms
Chapter 110 — A Psalm of David.
The LORD said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool.
The LORD shall send the rod of thy strength out of Zion: rule thou in the midst of thine enemies.
Thy people shall be willing in the day of thy power, in the beauties of holiness from the womb of the morning: thou hast the dew of thy youth.
The LORD hath sworn, and will not repent, Thou art a priest for ever after the order of Melchizedek.
The Lord at thy right hand shall strike through kings in the day of his wrath.
He shall judge among the heathen, he shall fill the places with the dead bodies; he shall wound the heads over many countries.
He shall drink of the brook in the way: therefore shall he lift up the head.