> As I understand it, it was added in a book of prayers that was popular amongst protestants. It's not in the bible.
Its in some but not other Greek texts of Matthew, notably, IIRC, the Textus Receptus that was the base for the Luther Bible. It is now generally viewed as an interpolation and excluded (except as a footnote) from most modern translations, but that was (obviously) not always the case for Protestants.
It’s worth noting that what is “in the Bible” isn’t always a simple question, since it’s not like each book has a complete, authenticated, original text accessible.
Its in some but not other Greek texts of Matthew, notably, IIRC, the Textus Receptus that was the base for the Luther Bible. It is now generally viewed as an interpolation and excluded (except as a footnote) from most modern translations, but that was (obviously) not always the case for Protestants.
It’s worth noting that what is “in the Bible” isn’t always a simple question, since it’s not like each book has a complete, authenticated, original text accessible.