'According to the Law' in the Bible

Then when the days of their purification according to the law of Moses were completed [Note: This was a set procedure required for a Jewish mother on the birth of a child. See Lev. 12:1-8], Joseph and Mary brought Jesus up to Jerusalem to present Him to the Lord.

how he entered the house of God [i.e., the Temple] and took some 'Bread of Presence' and ate it, and also gave some to his men to eat? [This practice] was not permissible according to the law of Moses, [since the bread was reserved] only for the priests."