Numbers 9:3-5

Amplified Bible, Classic Edition

³ On the fourteenth day of this month in the evening, you shall keep it at its appointed time; according to all its statutes and ordinances you shall keep it.

⁴ So Moses told the Israelites they should keep the Passover.

⁵ And they kept the Passover on the fourteenth day of the first month in the evening in the Wilderness of Sinai; according to all that the Lord commanded Moses, so the Israelites did.