3 Celebrate it at the appointed time, at twilight on the fourteenth day of this month, in accordance with all its rules and regulations.”

Read Numbers 9:3 Using Other Translations

In the fourteenth day of this month, at even, ye shall keep it in his appointed season: according to all the rites of it, and according to all the ceremonies thereof, shall ye keep it.
On the fourteenth day of this month, at twilight, you shall keep it at its appointed time; according to all its statutes and all its rules you shall keep it."
at twilight on the fourteenth day of the first month. Be sure to follow all my decrees and regulations concerning this celebration.”