Exodus 12:18

18 In the first month you are to eat bread made without yeast, from the evening of the fourteenth day until the evening of the twenty-first day.

Read Exodus 12:18 Using Other Translations

In the first month, on the fourteenth day of the month at even, ye shall eat unleavened bread, until the one and twentieth day of the month at even.
In the first month, from the fourteenth day of the month at evening, you shall eat unleavened bread until the twenty-first day of the month at evening.
The bread you eat must be made without yeast from the evening of the fourteenth day of the first month until the evening of the twenty-first day of that month.