we are talking about passover not about the festival of the unfermented cakes. This festival began Nisan 15, the day after Passover, and continued for seven days through Nisan 21.
Passover... like explained above was celebrated at the 14th in the first century,. by the jews,... Jesus christ and the first christians. Passover was followed by seven days of the Festival of Unfermented Cakes,
(Leviticus 23:5) 5 In the first month, on the fourteenth day of the month, between the two evenings is the passover to Jehovah.
(Numbers 28:16) “‘And in the first month, on the fourteenth day of the month, will be Jehovah’s passover.
(Ezekiel 45:21) 21 “‘In the first [month], on the fourteenth day of the month, there should occur for YOU the passover. . . .