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 122 — A Song of degrees of David.
I was glad when they said unto me, Let us go into the house of the LORD.
Our feet shall stand within thy gates, O Jerusalem.
Jerusalem is builded as a city that is compact together:
Whither the tribes go up, the tribes of the LORD, unto the testimony of Israel, to give thanks unto the name of the LORD.
For there are set thrones of judgment, the thrones of the house of David.
Pray for the peace of Jerusalem: they shall prosper that love thee.
Peace be within thy walls, and prosperity within thy palaces.
For my brethren and companions' sakes, I will now say, Peace be within thee.
Because of the house of the LORD our God I will seek thy good.