Luke 2:41

Now His parents went to Jerusalem every year at the feast of the Passover. God had commanded that every man should go to the Tabernacle or Temple three times a year, there to adore God publicly and offer Him sacrifices, Exo 23:14 and Deuteronomy 16:16. The Blessed Virgin, although not bound by the law, still, out of devotion, after her return from Egypt, joined her husband, and brought her son with her to the Temple, that she might teach mothers to bring their children, from their tender years, to the Temple, and to worship God. So say Bede, Maldonatus, Jansenius, Francis Lucas, and others. Nor did she fear Archeläus the son of the Infanticide Herod, both because she thought with good reason that, in so large a concourse of Jews, they would be able to escape observation for a few days, and also because she knew that God for whose honour she underwent this risk, had her in His mind and in His keeping. So says S. Augustine (de Consens. Evang., lib. ii cap. x), and S. Luke implies as much in the next two verses. Some however, think, with some probability, that Jesus only went up to Jerusalem in the twelfth year of His age, for in that year Archeläus was exiled by Augustus.