Exodus 23:16-18

New Revised Standard Version, Anglicised Catholic Edition

¹⁶ You shall observe the festival of harvest, of the first fruits of your labour, of what you sow in the field. You shall observe the festival of ingathering at the end of the year, when you gather in from the field the fruit of your labour. ¹⁷ Three times in the year all your males shall appear before the Lord God.

¹⁸ You shall not offer the blood of my sacrifice with anything leavened, or let the fat of my festival remain until the morning.