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 130 — A Song of degrees.
Out of the depths have I cried unto thee, O LORD.
Lord, hear my voice: let thine ears be attentive to the voice of my supplications.
If thou, LORD, shouldest mark iniquities, O Lord, who shall stand?
But there is forgiveness with thee, that thou mayest be feared.
I wait for the LORD, my soul doth wait, and in his word do I hope.
My soul waiteth for the Lord more than they that watch for the morning: I say, more than they that watch for the morning.
Let Israel hope in the LORD: for with the LORD there is mercy, and with him is plenteous redemption.
And he shall redeem Israel from all his iniquities.