Exodus 13:10 in the World English Bible
You shall therefore keep this ordinance in its season from year to year.
Context
9 And it shall be for a sign unto thee upon thine hand, and for a memorial between thine eyes, that the LORD’s law may be in thy mouth: for with a strong hand hath the LORD brought thee out of Egypt.
10 Thou shalt therefore keep this ordinance in his season from year to year.
11 And it shall be when the LORD shall bring thee into the land of the Canaanites, as he sware unto thee and to thy fathers, and shall give it thee,