In the first month, on the fourteenth day of the month at evening, you shall eat unleavened bread, until the one and twentieth day of the month at evening.
All Commentaries on Exodus 12:18 Go To Exodus 12
Richard Challoner
AD 1781
Unleavened bread: By this it appears, that our Saviour made use of unleavened bread, in the institution of the blessed sacrament, which was on the evening of the paschal solemnity, at which time there was no leavened bread to be found in Israel.