Exodus 23:14
“Three times thou shalt keep a feast unto me in the year.”
Six days thou shalt do thy work, and on the seventh day thou shalt rest: that thine ox and thine ass may rest, and the son of thy handmaid, and the stranger, may be refreshed.
And in all things that I have said unto you be circumspect: and make no mention of the name of other gods, neither let it be heard out of thy mouth.
Three times thou shalt keep a feast unto me in the year.
Thou shalt keep the feast of unleavened bread: (thou shalt eat unleavened bread seven days, as I commanded thee, in the time appointed of the month Abib; for in it thou camest out from Egypt: and none shall appear before me empty:)
And the feast of harvest, the firstfruits of thy labours, which thou hast sown in the field: and the feast of ingathering, which is in the end of the year, when thou hast gathered in thy labours out of the field.
Counter-Arguments
The strongest case that this verse does not belong in this theme.

Cross-References
“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:”
“After this there was a feast of the Jews; and Jesus went up to Jerusalem.”
“Thrice in the year shall all your men children appear before the Lord God, the God of Israel.”
“Three times in the year all thy males shall appear before the Lord God.”
“In the fourteenth day of the first month at even is the Lord’s passover.”