Halakhah к Берешит 17:4

And they, may their memory be blessed, also said (Mishnah Bikkurim 1:4) about this matter that converts bring them and recite, even though the land was not distributed to them. As it was given to Avraham first, and he was called "the father of many nations" (Genesis 17:4) - meaning to say that anyone who converts is considered like his son.