Commentaries:
Robertson's Word Pictures (NT)
A witness for him (martuv autw). As in Acts 1:8.
Of what (wn). Attraction of the accusative relative a to the genitive case of the unexpressed antecedent toutwn.
Thou hast seen and heard (ewrakav, present perfect active indicative kai hkousav, first aorist active indicative). This subtle change of tense is not preserved in the English. Blass properly cites the perfect ewraka in I Corinthians 9:1 as proof of Paul's enduring qualification for the apostleship.
Other Robertson's Word Pictures (NT) entries containing Acts 22:15:
Acts 9:3
Acts 9:10
1 Peter 5:1
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