The word translated here, day by day is of course “ epiousion.” Not only is the Our Father mentioned, but it is expected that the Christian will say it three times a day! That would imply they were praying the Our Father before the New Testament was even written.And do not pray like the hypocrites, but rather as the Lord commanded in the Gospel: ‘Our Father in heaven, holy be your name. Your kingdom come. Your will be done, on earth as it is in heaven. Give us enough bread day-by-day. And forgive us our debts, as we also have forgiven our debtors. And do not bring us to the time of trial, but rescue us from the evil one.’ Pray this three times each day.