Joshua 5:11
"And they did eat of the old corn of the land on the morrow after the passover, unleavened cakes, and parched corn in the selfsame day."
Cross References (ranked by relevance)
Leviticus 23:14
And ye shall eat neither bread, nor parched corn, nor green ears, until the selfsame day that ye have brought an offering unto your God: it shall be a statute for ever throughout your generations in all your dwellings.
Leviticus 23:6
And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread.