'Affirm' in the Bible

Then you must affirm before the Lord your God, "A wandering Aramean was my ancestor, and he went down to Egypt and lived there as a foreigner with a household few in number, but there he became a great, powerful, and numerous people.

Today he will affirm that you are his people and that he is your God, just as he promised you and as he swore by oath to your ancestors Abraham, Isaac, and Jacob.