Exodus 23:14-17

14 aThree times in the year you shall keep a feast to me. 15 bYou shall keep the Feast of Unleavened Bread. As I commanded you, you shall eat unleavened bread for seven days at the appointed time in the month of cAbib, for in it you came out of Egypt. dNone shall appear before me empty-handed. 16You shall keep ethe Feast of Harvest, of the firstfruits of your labor, of what you sow in the field. You shall keep the fFeast of Ingathering at the end of the year, when you gather in from the field the fruit of your labor. 17 gThree times in the year shall all your males appear before the Lord God.

Exodus 34:22-23

22 hYou shall observe the Feast of Weeks, the firstfruits of wheat harvest, and the Feast of Ingathering at the year’s end. 23 iThree times in the year shall all your males appear before the Lord God, the God of Israel.

1 Kings 9:25

25Three times a year Solomon used to offer up burnt offerings and peace offerings on the altar that he built to the Lord, making offerings with it
Septuagint lacks  with it
before the Lord. So he finished the house.

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