I believe it was in the last book of the series ("Deathly Hallows" I think) where Rowling referenced a Bible verse, "The last enemy to be destroyed is death" (I Cor. 15:26) on the gravestone of the parents of Harry Potter.
Yes.
Also, the good wizard Albus Dumbledore quotes the Bible word-for-word in placing an inscription on the tomb of his mother and sister, “Where your treasure is, there will your heart be also.”
Rowling is an annoying Liberal, and I do not look to her for deep wisdom on the salvation of my own soul, but the Harry Potter books do actually contain a surprising amount of Christianity.
Thanks. I don’t recall any other Bible verses in Rowling’s books.