We learn from the Holy Scriptures in the book of Acts, chapter two, that after Jesus ascended into heaven he sent the holy spirit on the day of Pentecost of the year 33 C.E., and the 120 disciples that Jesus taught and trained were all filled with this active force from God.
... They were Jehovah’s Christian witnesses now because they had faith in God’s Son, Christ Jesus, who redeemed them from death, and they believed in the kingdom of God.