QUESTION: What is the feast mentioned in 1 Cor. 5:8? "Let us keep the feast, not with old leaven, neither with the leaven of malice and wickedness; but with the unleavened bread of sincerity and truth.”
ANSWER: The Passover and the Feast are really two distinct things, and the feast is founded on the Passover—on the sacrifice. But they cannot be separated, though they are distinct. The Passover was on one day; the Feast of the Passover was on the next day, and lasted seven days. "Christ our Passover is sacrificed for us: therefore let us keep the feast." 1 Cor. 5:7, 8. The Church of God is now keeping two feasts, according to our calling. For example, she is keeping the Feast of the Passover and the Feast of Pentecost, and she is waiting to keep the Feast of Tabernacles. We get those three feasts brought together in the Old Testament.
“Three times in a year shall all thy males appear before the Lord thy God.... They shall not appear before the Lord empty" Deut. 16:16. There were three feasts which all were expected to attend: the Passover, Pentecost, and Tabernacles. Christ, our Passover, is sacrificed for us. The day of Pentecost has fully come. What is before us is the Feast of Tabernacles—the ingathering. In short, it is the rest of God when He has gathered in the fruit of all His ways, and when the saints enter into the fruits of all God's ways with them.