On: every psalm and song in the daily prayers uses today’s English. Off: all of them use the older “thee and thou”. Until you choose, the Songs of Zechariah, Mary and Simeon use today’s English, as most churches sing them. The Lord’s Prayer and the prayers for the dying show the form most people learned.
The formal pronouncement of forgiveness of sins. Lutherans treat absolution as a genuine means of grace, closely tied to confession (see Confession, below).
In Sacraments — Baptism, the Lord's Supper, confession, and the language around them.