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 52 — To the chief Musician, Maschil, A Psalm of David, when Doeg the Edomite came and told Saul, and said unto him, David is come to the house of Ahimelech.
Why boastest thou thyself in mischief, O mighty man? the goodness of God endureth continually.
The tongue deviseth mischiefs; like a sharp razor, working deceitfully.
Thou lovest evil more than good; and lying rather than to speak righteousness. Selah.
Thou lovest all devouring words, O thou deceitful tongue.
God shall likewise destroy thee for ever, he shall take thee away, and pluck thee out of thy dwelling place, and root thee out of the land of the living. Selah.
The righteous also shall see, and fear, and shall laugh at him:
Lo, this is the man that made not God his strength; but trusted in the abundance of his riches, and strengthened himself in his wickedness.
But I am like a green olive tree in the house of God: I trust in the mercy of God for ever and ever.
I will praise thee for ever, because thou hast done it: and I will wait on thy name; for it is good before thy saints.