Albert Barnes Commentary John 8:38

"I speak the things which I have seen with [my] Father: and ye also do the things which ye heard from [your] father." — John 8:38 (ASV)

I speak, and so forth (John 3:11–13).

My Father: God.

Your father: The devil. See John 8:44. To see here means to learn from. They had learned from or been taught by the devil, and imitated him.