People have been puzzled for generations about whether both Old and New Testaments are still in effect today. Do we have to obey both of them? Do we still have to go to Jerusalem three times a year? Do we still have to offer animal sacrifice for our sins? There is an Old Testament and a New Testament (Heb. 7:22; Heb. 8:1-5; Heb. 8:6-13; Heb. 9:14-15; Heb. 12:24).