Final answer:
The apostles were looking up to the sky as Jesus was ascending into heaven, a key event described in the Gospels.
Step-by-step explanation:
As Jesus was ascending into heaven, his apostles were looking up to the sky. This event, known as the Ascension, is recorded in the New Testament of the Bible and depicts Jesus' followers, watching as He is taken up into heaven. The apostles' gaze upwards is a significant detail, emphasizing both the miraculous nature of the event and their continued devotion following Jesus' resurrection. This account is found in the Gospels, which are biographical accounts of Jesus' life, including His teachings, death, and resurrection, ultimately leading to the spread of Christianity by His followers who carried forward His message as part of their mission.