God is very clear at the end of the Bible (Revelation 22) that we should not add to or take away from the written word of God. Plagues are for those who add to the Bible, while the ones who take away from the sacred word lose their heavenly reward. What do we do with the Lord’s Prayer ending, “for yours is the kingdom and the power and the glory, forever”? Look it up! You won’t find it in Matthew 6 or Luke 11. You will find in the footnotes of those passages a statement saying some manuscripts add “For yours is the kingdom and the power and the glory, forever. Amen.” There are other places in the Scriptures that carry this same footnote. The longer ending to Mark’s Gospel is an example. Many do not believe it is part of the Bible.
Should we pray the ending to the Lord’s Prayer? Are we in danger of plagues (Revelation 22) because we are adding to the Bible? Do a search of similar phrases in the Scriptures and you will find that similar wording and meaning can be found in 1 Chronicles 29. The words, concepts, and theology of the church’s traditional and final form of the Lord’s Prayer ending are biblical but not in the Bible. Specifically, they are not in Jesus’ prayer that he taught his disciples and which was laid down by Luke and Mark under the Holy Spirit’s superintendence. We can and should pray them, however, because they are biblical and God will hear them when prayed in faith (James 5).
The Hedelberg Catechism explains the petition this way, “This means we have made all these petitions of you because, as our all-powerful king, you are both willing and able
to give us all that is good; and because your holy name, and not we ourselves, should receive all the praise, forever.”
When you pray, as your bring your petitions to your great and powerful King, have absolute faith in your God (Hebrews 2, 5, 7, 11) who is able!