This weekend we are celebrating the Third Sunday of Advent. 

O come, Emmanuel.

The communion antiphon for today is from Isaiah chapter 35, verse 3:

"Say to the faint of heart: Be strong and do not fear.

Behold, our God will come, and he will save us."

Now, the psalm this weekend is actually not from the book of Psalms, but instead is from Luke Chapter 1:

"My soul rejoices in my God."

http://www.themodernpsalmist.com