The Promise of the Holy Spirit
The Greek word used here for witness is martys (from which we get "martyr"), meaning a legal or personal witness—someone who testifies to what they have seen, heard, and personally experienced.
Scripture and historical theology outline several key ways a Christian acts as Jesus' witness:
1. Empowered by the Holy Spirit (The Source) A believer cannot witness effectively through human effort alone. As Jesus emphasized in Acts 1:8 LSB, witnessing begins with the indwelling power of the Holy Spirit, who grants boldness, guidance, spiritual gifts, and spiritual fruit to testify to Christ.
2. Proclaiming the Gospel (Verbal Testimony) To be a witness requires spoken or written communication. A Christian testifies to:
The Person and Work of Christ: Proclaiming His life, sacrificial death on the cross, physical resurrection, and lordship.
Personal Experience: Sharing how Christ has transformed their own life, brought forgiveness, and given hope.
3. Living a Holy and Loving Life (Moral & Relational Testimony) Verbal witness is supported by a transformed character:
Love for Others: Jesus noted that people would know His disciples by their love for one another (
). John 13:35 LSB Good Deeds: Living in a way that brings glory to God so others see Christ through ethical living, integrity, and mercy (
). Matthew 5:16 LSB 4. Enduring Suffering and Rejection (Faithful Endurance) Because martys carries the weight of sacrifice, being a witness often involves being willing to face ridicule, opposition, or persecution for holding fast to the truth of Christ without backing down.
5. Reaching Expanding Circles (The Scope) Jesus outlined a geographic strategy that applies spiritually and practically to every believer:
Jerusalem: One's immediate sphere (family, friends, workplace, local community).
Judea & Samaria: Expanding into neighboring regions and cross-cultural contexts (including people who are different or historically alienated).
End of the Earth: Supporting or participating in global missions to unreached peoples.
The Ascension
Matthias Chosen to Replace Judas
The Holy Spirit Comes at Pentecost
Peter’s Sermon at Pentecost
[32] "This Jesus God raised up again, to which we are all witnesses.
[33] "Therefore having been exalted to the right hand of God, and having received from the Father the promise of the Holy Spirit, He has poured out this which you both see and hear.
[34] "For David did not ascend into the heavens, but he himself says: 'THE LORD SAID TO MY LORD, "SIT AT MY RIGHT HAND,
[35] UNTIL I PUT YOUR ENEMIES AS A FOOTSTOOL FOR YOUR FEET."'
[36] "Therefore let all the house of Israel know for certain that God has made Him both Lord and Christ--this Jesus whom you crucified."
About Three Thousand Souls Saved
“The old-fashioned grace of repentance is not to be dispensed with; there must be sorrow for sin; there must be ‘a broken and a contrite heart.’ This, God will not despise; but a ‘conversion’ which does not produce this result, God will not accept as genuine.”