This is the last psalm of the collection or group called “Songs of Degrees,” and it is of the nature of a doxology as now sung in our places of worship. Its author is unknown. From anything that appears in the psalm itself, it may have been composed originally to occupy the very place which it does occupy here. The psalm is a summons to praise, and it would seem not improbable that it was designed to be sung by alternate choirs - the first Psalms 134:1-2 representing the people approaching the sanctuary, calling on those who habitually serve God there - the ministers of religion - to lift up their hands in the sanctuary and to praise the Lord; the second Psalms 134:3, the response of the priests or the ministers of religion, pronouncing a blessing on the people - a blessing as proceeding out of Zion.