My sister has been pursuing something she calls “her journey” which includes attempting to speak to her pets as well as to the Archangels Michael and Raphael, the virgin Mary, and several saints. She asks me where the Bible says this is not allowed? When I could not point to a biblical reference she took that as proof that what she is doing is just fine with God. She said she “takes Jesus alongside her every time she goes on a journey and claims to have lived two other times in different eras of history. I know “it is appointed once for man to die, then the judgment” but I cannot recall where that verse is either. I need to arm myself a lot better with the Bible to be able to give her solid testimony.
The prohibition against communicating with the spirit world is in Deut. 18:10-12. The argument against re-incarnation is in Hebrews 9:27. Your sister is flirting with false religion and the Jesus she claims to take with her is an impostor. The real Jesus would not accompany us into areas He has forbidden to us.
The easiest thing to do when you can’t find a Bible verse is type a portion of the verse into a Google search box. Within seconds you’ll have the specific reference.