{We are witnesses} (h(886d)eis esmen martures). As in  2:32 .
{Things} (
h(886d)at(936e)). Literally, sayings, but like the Hebrew
_dabhar_ for "word" it is here used for "things." {And so is the
Holy Ghost} (kai to pneuma to hagion). The word for "is"
(estin) is not in the Greek, but this is plainly the meaning.
Peter claims the witness of the Holy Spirit to the raising of
Jesus Christ, God's Son, by the Father.