Exodus 23:14-19 - Laws For Three Festivals
14 Three times thou shall keep a feast to me in the year. 15 Thou shall keep the feast of unleavened bread (Seven days thou shall eat unleavened bread, as I commanded thee, at the time appointed in the month Abib, for in it thou came out from Egypt, and none shall appear before me empty), 16 and the feast of harvest, the first-fruits of thy labors, which thou sow in the field, and the feast of ingathering at the end of the year, when thou gather in thy labors out of the field. 17 Three times in the year all thy males shall appear before lord LORD.
18 Thou shall not offer the blood of my sacrifice with leavened bread, neither shall the fat of my feast remain all night until the morning.
19 The first of the first-fruits of thy ground thou shall bring into the house of LORD thy God. Thou shall not boil a kid in its mother's milk.