'Fourteenth' in the Bible

On the fourteenth day of this month {at twilight} you will perform it at its appointed time according to all its decrees; and according to all its stipulations you will observe it."

And they observed the Passover on the fourteenth day of the month {at twilight} in the desert of Sinai. According to all that Yahweh commanded Moses, thus the {Israelites} did.

On the second month on the fourteenth day {at twilight} they will observe it; they will eat it with unleavened bread and bitter plants.

" 'On the fourteenth day of the first month [is] the Passover for Yahweh.