Roman Catechism 8.4

Chapter 8 — Part I: The Creed — Article VI: He Ascended into Heaven, Sitteth at the Right Hand of God, the Father Almighty

Section 4. "Into Heaven" — This, then, the faithful must believe without hesitation, that Jesus Christ, having fully accomplished the work of Redemption, ascended as man, body and soul, into heaven; for as God He never forsook heaven, filling as He does all places with His Divinity.