Final answer:
The disciples received the Holy Spirit on Pentecost, which allowed them to speak in various languages and spread the teachings of the crucified and risen Christ, marking a major event in Christian history.
Step-by-step explanation:
On the day of Pentecost after Christ's Resurrection, the disciples, also referred to as the Apostles, experienced the descent of the Holy Spirit. This event is narrated in Acts 2 and took place fifty days after Easter (Pascha). According to the account, the Holy Spirit appeared in the form of tongues of fire and inspired the Apostles to preach about the crucified and risen Christ. They were given the ability to speak in different languages, enabling people from various regions to understand their message. This miraculous event marked the beginning of the Christian Church's mission to spread the teachings of Jesus and is a significant moment in Christian history.