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.