Exodus 23:14
Three times every year you shall celebrate feasts to me.

Exodus 23:17
Thrice a year shall all thy males appear before the Lord thy God.

Deuteronomy 16:16
Three times in a year shall all thy males appear before the Lord thy God in the place which he shall choose: in the feast of unleavened bread, in the feast of weeks, and in the feast of tabernacles. No one shall appear with his hands empty before the Lord:

1 Samuel 1:3
And this man went up out of his city upon the appointed days, to adore and to offer sacrifice to the Lord of hosts in Silo. And the two sons of Heli, Ophni and Phinees, were there priests of the Lord.

2 Chronicles 8:13
That every day an offering might be made on it according to the ordinance of Moses, in the sabbaths, and on the new moons, and on the festival days three times a year, that is to say, in the feast of unleavened bread, and in the feast of weeks, and in the feast of tabernacles.

Psalm 84:7
For the lawgiver shall give a blessing, they shall go from virtue to virtue: the God of gods shall be seen in Sion.

Ezekiel 46:9
But when the people of the land shall go in before the Lord in the solemn feasts, he that goeth in by the north gate to adore, shall go out by the way of the south gate; and he that goeth in by the way of the south gate, shall go out by the way of the north gate: he shall not return by the way of the gate whereby he came in, but shall go out at that over against it.