December 15, 2019: 3rd Sunday of Advent
The antiphon is taken directly from the 2nd Reading.
Be patient, therefore, brothers, until the coming of the Lord.
and James 5:8
You too must be patient. Make your hearts firm,
because the coming of the Lord is at hand.
Psalm verses from Ps 85 and large extracts from Isaiah 35 complete the picture, with the verse tone superimposed on the antiphon.
It would also be possible today to use the Psallite setting for the 3rd Sunday of Advent, Years B and C, which corresponds exactly with the Communion antiphon and canticle (from Isaiah 35, the same text appearing in today’s 1st Reading) in all the sources: