1:8

the holy spirit: Or “the holy active force.” In the book of Acts, the expression “holy spirit” occurs 41 times, and there are at least 15 other occurrences of the term “spirit” (Greek, pneuʹma) that refer to God’s holy spirit. (For examples, see Ac 2:4, 17, 18; 5:9; 11:28; 21:4; see also Glossary, “Spirit.”) Thus, this Bible book makes it clear again and again that the international preaching and teaching work to be performed by Jesus’ followers could be accomplished only with the aid of God’s active force.​—Compare study note on Mr 1:12.

witnesses of me: As faithful Jews, Jesus’ early disciples were already witnesses of Jehovah, and they testified that Jehovah is the only true God. (Isa 43:10-12; 44:8) Now, though, the disciples were to be witnesses of both Jehovah and Jesus. They were to make known Jesus’ vital role in sanctifying Jehovah’s name by means of His Messianic Kingdom, a new feature of Jehovah’s purpose. With the exception of John’s Gospel, Acts uses the Greek terms for “witness” (marʹtys), “to bear witness” (mar·ty·reʹo), “to bear thorough witness” (di·a·mar·tyʹro·mai), and related words more times than any other Bible book. (See study note on Joh 1:7.) The idea of being a witness and bearing thorough witness about God’s purposes​—including his Kingdom and Jesus’ vital role​—is a theme that runs through the book of Acts. (Ac 2:32, 40; 3:15; 4:33; 5:32; 8:25; 10:39; 13:31; 18:5; 20:21, 24; 22:20; 23:11; 26:16; 28:23) Some first-century Christians bore witness to, or confirmed, historical facts about Jesus’ life, death, and resurrection from their firsthand knowledge. (Ac 1:21, 22; 10:40, 41) Those who later put faith in Jesus bore witness by proclaiming the significance of his life, death, and resurrection.​—Ac 22:15; see study note on Joh 18:37.

to the most distant part of the earth: Or “to the ends (extremity) of the earth.” The same Greek expression is used at Ac 13:47 in a prophecy quoted from Isa 49:6, where the Greek Septuagint also uses the term. Jesus’ statement at Ac 1:8 may echo that prophecy, which foretold that Jehovah’s servant would be “a light of nations” so that salvation would reach “the ends of the earth.” This harmonizes with Jesus’ previous statement that his followers would perform “works greater” than his. (See study note on Joh 14:12.) The statement is also in line with Jesus’ description of the worldwide scope of the Christian preaching work.​—See study notes on Mt 24:14; 26:13; 28:19.