Ask them that have heard me (erwthson tou akhkoota). First aorist (tense of urgent and instant action) active imperative of erwtaw and the articular perfect active participle accusative masculine plural of akouw, to hear. There were abundant witnesses to be had. Multitudes had heard Jesus in the great debate in the temple on Tuesday of this very week when the Sanhedrin were routed to the joy of the common people who heard Jesus gladly ( Mark 12:37 ). They still know.