Liturgical Colour : Green

Hebrews 10 : 11-14, 18

So, whereas every priest stands, daily, by the Altar, offering, repeatedly, the same sacrifices, that can never take away sins, Christ has offered, for all times, a single sacrifice for sins, and has taken His seat at the right hand of God, waiting, until God puts His enemies as a footstool under His feet.

By a single sacrifice He has brought those who are sanctified to what is perfect forever. So, if sins are forgiven, there is no longer need of any sacrifice for sin.