Here’s a benediction based on Isaiah 40:1-11 (and by extension Mark 1:2-3 and Luke 3:4-6). It was written by Rev. Richard J. Fairchild and posted on his Kir-shalom website.
(based on Isaiah 40:1-11)
Go in peace—
love and care for one another in the name of Christ;
—and may the power of the Holy Spirit
make the rough places in your life smooth,
—may the dark valleys of your hearts
be filled and the rugged mountains leveled
and the way of the Lord be made ready in you,
—and may He come unto you
and bless you and shine forth from you
both now and forevermore. Amen.
— copyright © Rev. Richard J. Fairchild, and posted on his Kir-Shalom website. Visit his site for other lectionary-based worship resources and sermons.