What is the religious ruling concerning a man who swore by Allah that he remembers his life before birth, relying on the Almighty’s saying?

A man who takes a false, perjurious oath (yamin ghamus) must initiate repentance and seek forgiveness. He is not required to offer an expiation for an oath (kaffarat yamin) according to the majority of scholars. However, piety dictates offering it to avoid scholarly disagreement.