He kneeled down (qei ta gonata autou). Second aorist active participle of tiqhmi, to place. The very idiom used in Matthew 7:60 of Stephen. Not in ancient writers and only six times in the N.T. ( Mark 15:19 ; Luke 22:41 ; Acts 7:60 ; Acts 9:40 ; Acts 20:36 ; Acts 21:5 ). Certainly kneeling in prayer is a fitting attitude (cf. Jesus, Luke 22:41 ), though not the only proper one ( Matthew 6:5 ). Paul apparently prayed aloud (proshuxato).