Acts 1:8-9

But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth. {power...: or, the power of the Holy Ghost coming upon you} And when he had spoken these things, while they beheld, he was taken up; and a cloud received him out of their sight.