The Evangelists usually make Peter the spokesperson for all
 the apostles.
Mark 8:29
And he (Jesus) asked them, "But who do you say that
I am?" Peter said to him in reply, "You are the Messiah."
Matthew 18:21
Then Peter approaching asked him, "Lord, if my brother
sins against me, how often must I forgive him? As many
as seven times?"
Luke 12:41
Then Peter said, "Lord, is this parable meant for us or
for everyone?"