Ohhhhh Sarah...
If you went back 1,000 years this is what English would look like and also how it might sound:
THE LORD'S PRAYER
Fæder ūre, ðū ðē eart on heofonum,
Sī ðīn nama gehālgod.
Tō becume ðīn rice.
Gewurde ðīn willa
On eorþan swā swā on heofonum.
Urne gedæghwamlīcan hlāf syle ūs tōdæg.
And forgyf ūs ūre gyltas,
Swā swā wē forgyfaþ ūrum gyltendum.
And ne gelæd ðū ūs on costnunge,
ac alȳs ūs of yfele.
https://www.youtube.com/watch?v=7Wl-OZ3breE
AD 1988
Our Father in heaven,
hallowed be your name,
your kingdom come,
your will be done,
on earth as in heaven.
Give us today our daily bread.
Forgive us our sins
as we forgive those who sin against us.
Save us from the time of trial
and deliver us from evil.
[For the kingdom, the power,
and the glory are yours now and for ever.]
Amen.