{A witness for him} (martus aut(9369)). As in  1:8 . {Of
what} (h(936e)). Attraction of the accusative relative ha to the
genitive case of the unexpressed antecedent 	out(936e). {Thou hast
seen and heard} (he(9372)akas, present perfect active indicative
kai (886b)ousas, first aorist active indicative). This subtle
change of tense is not preserved in the English. Blass properly
cites the perfect he(9372)aka in  1Co 9:1  as proof of Paul's
enduring qualification for the apostleship.