The Confiteor is a general confession of sin initiated by the priest and continued by the congregation at the start of the Liturgy.
I confess to almighty God,
and to you, my brothers and sisters,
that I have greatly sinned,
in my thoughts and in my words,
in what I have done and in what I have failed to do,
through my fault, through my fault,
through my most grievous fault;
therefor I ask blessed Mary ever-virgin,
all the angels and saints,
and you, my brothers and sisters,
to pray for me to the
Lord our God.