They ate some of the produce of the land the day after the Passover, including unleavened bread and roasted grain.
You must not eat bread, roasted grain, or fresh grain until this very day, until you bring the offering of your God. This is a perpetual statute throughout your generations in all the places where you live.
Then on the fifteenth day of the same month will be the festival of unleavened bread to the Lord; seven days you must eat unleavened bread.
and you eat some of the food of the land, you must offer up a raised offering to the Lord.
So the Israelites camped in Gilgal and celebrated the Passover in the evening of the fourteenth day of the month on the plains of Jericho.
The manna stopped appearing the day they ate some of the produce of the land; the Israelites never ate manna again.