Alqamah narrates: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) was asked about this, and he said: "When I reach that point, I take a ritual bath (ghusl)."
Sufyan (al-Thawri) said: And all the people of knowledge agree on this.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 9220