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 70 — To the chief Musician, A Psalm of David, to bring to remembrance.
Make haste, O God, to deliver me; make haste to help me, O LORD.
Let them be ashamed and confounded that seek after my soul: let them be turned backward, and put to confusion, that desire my hurt.
Let them be turned back for a reward of their shame that say, Aha, aha.
Let all those that seek thee rejoice and be glad in thee: and let such as love thy salvation say continually, Let God be magnified.
But I am poor and needy: make haste unto me, O God: thou art my help and my deliverer; O LORD, make no tarrying.