Final answer:
The Gospel of Luke and the Acts of the Apostles both narrate Jesus's ascension into heaven.
Step-by-step explanation:
The Gospel that narrates Jesus's ascension into heaven is the Gospel of Luke, specifically in Luke 24:50-53. Additionally, this event is also mentioned in the Acts of the Apostles, Acts 1:9-12, which is also attributed to Luke. The Ascension signifies Jesus being taken up into heaven after his resurrection, an event celebrated by Christians on Ascension Day, which occurs forty days after Easter.