"Three times in the year all your males shall appear before the Lord GOD.
Exodus 23:17
Surrounding context
23:16 and the Feast of Harvest, the firstfruits of your labors which you have sown in the field; and the Feast of Ingathering at the end of the year, when you have gathered in the fruit of your labors from the field.
23:17 "Three times in the year all your males shall appear before the Lord GOD.
23:18 "You shall not offer the blood of My sacrifice with leavened bread; nor shall the fat of My sacrifice remain until morning.