The last of the Songs of Ascent.
The psalmist commands worshippers to "Bless the LORD." (v. 1)
He speaks of SERVANTS (v.1) in the SANCTUARY (v. 2) and of their SALVATION (v. 3). Salvation? Yep. "The LORD bless you from Zion = Jersualem." And what happened in Jerusalem intended to bless the world? The sacrifice of Jesus Christ. (NOTE: See Psalm 133: 3 "...Zion, from there the LORD commanded the blessing - Life forevermore.")
What does it mean to "bless"? It means "to bestow favor upon"; some like to suggest "to make happy". I like that.
How do I bless/make happy the Lord? Service and Worship "...stand by night in the sanctuary" = service "...lift up your hands" = worship. Did you realize that your service and your worship can make the Lord happy?
How does the Lord bless me? He is called the Creator ("...made heaven and earth...") AND He has given us salvation ("...bless you from Zion." - see above).
And notice the cycle of blessing in this verse. We bless/make happy the Lord with our service and worship. The Lord makes us happy with new beginnings and with new life!
So much to see in such a little psalm. So much to do.