Exodus 23:16-18

Amplified Bible

¹⁶Also [you shall observe] the Feast of Harvest (Weeks, Pentecost, or First Fruits), acknowledging the first fruits of your labor, of what you sow in the field. And [third] the Feast of Ingathering (Booths or Tabernacles) at the end of the year when you gather in [the fruit of] your labors from the field. ¹⁷Three times a year all your males shall appear before the ^[a]Lord God.

¹⁸“You shall not offer the blood of My sacrifice with ^[b]leavened bread; and the fat of My feast is not to be left overnight until morning.

Read full chapter

Footnotes

Exodus 23:17 “Lord” with only an initial capital is Heb Adonai (Master); “God” (all caps) represents YHWH (Yahweh) and is usually rendered “Lord” (all caps).
Exodus 23:18 Because leaven is a kind of fungus, it became a symbol of corruption and sin. But in some contexts it had positive connotations (e.g. Lev 23:17; Matt 13:33).