In Acts 1:8, the disciples would receive power when who came upon them?

Answer: The Holy Spirit

Jesus said, 'You will receive power when the Holy Spirit comes upon you, and you will be My witnesses... to the ends of the earth.'

“But you will receive power when the Holy Spirit comes upon you, and you will be My witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth.””— Acts 1:8 (BSB)