Ancient Israel was given a system of sacrifices; daily evening and morning, weekly on the Sabbath, monthly in the new moon and annually on 7 feast days; first day of unleavened bread, last day of unleavened bread, Pentecost, trumpets, atonement, first day of tabernacles and the last great day. On all of these days sacrifices were commanded, working prohibited and offerings made. All these days were the sacrifices of Israel. 1 Samuel 1:3. Nehemiah 8:1-18. 2 Kings 22:8-13. Ezra 3:2-5. All the days in the law of Moses were for sacrifices. Jesus fulfilled all of these days but if any continue doing so deny the sacrifice of Christ. This will be the deception used by the man of sin when the third temple is built. Acts 15:1-24 The apostles ruled that Christians do not keep the law of Moses which contained the days of sacrifice along with other carnal works of the law. Any church keeping these carnal works is not Christian and deny Jesus and preach heresy. More on this and the man of sin will come later.