Leviticus 26:10

And ye shall eat old store, and bring forth the old because of the new.

You shall eat old store long kept, and you shall move out the old because of the new.

And ye shall eat old store long kept, and ye shall bring forth the old because of the new.

and ye have eaten old `store', and the old because of the new ye bring out.

You will still be eating the old supply of grain when you need to clear it out to make room for the new.