Acts 2:14

But Peter, standing up with the eleven, lifted up his voice, and said unto them, Ye men of Judaea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words:

But Peter, standing up (along) with the eleven - by which they held themselves forth at once as the responsible representatives of the new Faith,

Lifted up his voice, and said, [ apefthengxato (G669)] - 'spake forth,' implying the formality and solemnity of it;

Unto them, Ye men of Judea, and all ye that dwell at Jerusalem, be this known unto you, and hearken to my words, [ enootisasthe (G1801), only here and Genesis 4:23, Septuagint] - an exordium befitting this high occasion.