משנה על מעשרות 1:2

From when may one begin to eat of the fruit of the trees in the seventh year? With unripe figs as soon as they assume a rosy appearance, one may eat them in the field with his bread. Once they have begun to ripen, he may take them home. And similarly in the other years of the sabbatical cycle [when this latter stage has been reached] they are subject to tithes.