Make Not Provision For The Flesh

Why the Feast of of Unleavened Bread? AS believers justified by the sacrifices of Jesus Christ, our Passover, why observe this Old Testament Feast? Is it because we are still subject to the timeless temptations of sin an that these days emphasize the need to continue putting away the leaven of sin until Christ returns? Of course, overcoming the works of the flesh can only be done by walking in the spirit of God and following in the footsteps of Jesus Christ and his love and casting out sin.