Exodus 23:17

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, and in the feast of weeks, and in the feast of tabernacles: and they shall not appear before the LORD empty:

Thrice in the year shall all your menchildren appear before the LORD God, the God of Israel.

But unto the place which the LORD your God shall choose out of all your tribes to put his name there, even unto his habitation shall ye seek, and thither thou shalt come:

Three times thou shalt keep a feast unto me in the year.

When all Israel is come to appear before the LORD thy God in the place which he shall choose, thou shalt read this law before all Israel in their hearing.

And when he was twelve years old, they went up to Jerusalem after the custom of the feast.

They go from strength to strength, every one of them in Zion appeareth before God.