Numbers 9:3-5

New King James Version

³ On the fourteenth day of this month, ^[a]at twilight, you shall ^[b]keep it at its appointed time. According to all its ^[c]rites and ceremonies you shall keep it.” ⁴ So Moses told the children of Israel that they should keep the Passover. ⁵ And ^(A)they kept the Passover on the fourteenth day of the first month, at twilight, in the Wilderness of Sinai; according to all that the Lord commanded Moses, so the children of Israel did.