For the feast of the Nativity of St. John the Baptist:

By all Your saints in warfare,
For all Your saints at rest,
Your holy name, O Jesus,
Forevermore be blest!
For You have won the battle
That they might wear the crown;
And now they shine in glory
Reflected from Your throne.

We praise You for the Baptist,
Forerunner of the Word,
Our true Elijah, making
A highway for the Lord.
The last and greatest prophet,
He saw the dawning ray
Of light that grows in splendor
Until the perfect day.

And worship God the Son
And sing to God the Spirit,
Eternal Three in One,
Till all the ransomed number
Fall down before the throne,
Ascribing pow’r and glory
And praise to God alone. Lutheran Service Book #518, verses 1, 18, and 3

And a bonus canticle, from the service of Morning Prayer, based on the Song of Zechariah in Luke 1:68-79:

Blessed be the Lord, the God of Israel;
He has come to His people and redeemed them.
He has raised up for us a mighty Savior,
born of the house of His servant David.
Through His holy prophets He promised of old
that He would save us from our enemies,
from the hands of all who hate us.
He promised to show mercy to our fathers
and to remember His holy covenant.
This was the oath He swore to our father Abraham:
to set us free from the hands of our enemies,
free to worship Him without fear,
holy and righteous in His sight
all the days of our life.
You, my child, shall be called the prophet of the Most High,
for you will go before the Lord to prepare His way,
to give His people knowledge of salvation
by the forgiveness of their sins.
In the tender compassion of our God,
the dawn from on high shall break upon us
to shine on those who dwell in darkness and the shadow of death
and to guide our feet into the way of peace.
Glory be to the Father and to the Son and to the Holy Spirit;
as it was in the beginning, is now, and will be forever. Amen.