The place was shaken (esaleuqh o topo). By an earthquake most likely as in Isaiah 16:26 , but none the less a token of God's presence and power ( Psalms 114:7 ; Isaiah 2:19Isaiah 2:21 ; Hebrews 12:26 ). Were gathered together (hsan sunhgmenoi). Periphrastic past perfect passive of sunagw. They spake (elaloun). Imperfect active indicative, began to speak, after being filled (eplhsqhsan, aorist passive indicative) with the Holy Spirit. Luke uses the very words of the prayer in verse Hebrews 29 to describe their conduct.