Quick answer
In Acts 1:8, Jesus promises the Holy Spirit’s power and tells his followers they will be his witnesses. The sentence joins empowerment with a mission extending from Jerusalem to the ends of the earth. The Greek helps us follow those connections; it does not supply a hidden message missing from ordinary English translations.
Read the question before the promise
In Acts 1:6–7, the disciples ask about restoring the kingdom to Israel. Jesus says the times and seasons are not theirs to know. Verse 8 turns to what they are given: the Spirit’s power and their work as witnesses. Verses 9–11 then describe his ascension and the promise of his return.
Three questions help trace the passage:
- What do the disciples ask to know in verses 6–7?
- What does Jesus promise, and what does he say his followers will be?
- How do the places named in verse 8 widen the scope of their witness?
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Three Greek expressions to notice
The SBL Greek New Testament reads δύναμιν (dynamin), the form translated “power” here. Read it within the sentence: the Holy Spirit comes upon Jesus’ followers, and they will be his witnesses. A dictionary’s possible meanings should not all be loaded into this one occurrence.
The expression ἔσεσθέ μου μάρτυρες means “you will be my witnesses.” The verb is esesthe, not esesthai. The wording identifies whom their witness concerns; it does not establish a separate doctrine simply because English uses “be.”
The opening ἀλλά is “but.” It marks a contrast with verses 6–7. English translations already communicate that contrast. Its presence alone does not establish how sharply Jesus spoke or prove that every aspect of the disciples’ question was mistaken.
What grammar does not settle
The promise belongs to Jesus’ speech in this setting. A future verb by itself does not tell us every later circumstance in which the promise applies. Nor does the participle describing the Spirit’s coming, by itself, settle debates about subsequent experiences of the Spirit. Those questions require wider study.
Likewise, do not import every later association of “martyr” into the word for witness here. Start with the testimony about Jesus that the surrounding narrative describes. Acts 1:21–22 explicitly connects the replacement apostle’s witness with Jesus’ resurrection.
From Jerusalem outward
Jerusalem, Judea, Samaria and the ends of the earth name an expanding scope. Keep that movement visible when applying the verse. The passage is not a promise of personal prestige or a formula for gaining influence. A useful study question is how dependence on the Spirit and attention to Jesus shape the purpose of witness.
Sources and study boundary
Compare Acts 1:6–11 and 1:21–22 in the World English Bible with Acts 1:8 in the SBL Greek New Testament. The short Greek quotations are from The Greek New Testament: SBL Edition, copyright 2010 Society of Biblical Literature and Logos Bible Software. These notes are a study aid; check interpretations against the passage and trusted sources.