1st John 5:7
Acts 20:28
Also ask him who the us is in Genesis 1:26. Eloheem is plural in a singular form.
Also point him to
Exo_3:14 And God said unto Moses, I AM THAT I AM: and he said, Thus shalt thou say unto the children of Israel, I AM hath sent me unto you
then oh 8:56 Your father Abraham rejoiced to see my day: and he saw it, and was glad.
Joh 8:57 Then said the Jews unto him, Thou art not yet fifty years old, and hast thou seen Abraham?
Joh 8:58 Jesus said unto them, Verily, verily, I say unto you, Before Abraham was, I am.
Joh 8:59 Then took they up stones to cast at him: but Jesus hid himself, and went out of the temple, going through the midst of them, and so passed by.
Joh 10:30 I and my Father are one.
Joh 10:31 Then the Jews took up stones again to stone him.
Joh 10:32 Jesus answered them, Many good works have I shewed you from my Father; for which of those works do ye stone me?
Joh 10:33 The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God.