Mishnah, — Seder Zeraim, Tractate OrlahChapter 1
“ Leaves, sprouts, the sap of vines and vine buds, are permitted regarding orlah, revai [fourth year produce, which have similar laws as ma'aser sheni] and to a nazir, but are prohibited from an [idolatry] asheirah [tree] . Rabbi Yose says: vine-buds are prohibited because it is in fact a fruit. Rabbi Eliezer [maintains that all sap, even from non-fruit trees are considered as fruit and] says: If one curdles milk with the resin of orlah, it is prohibited [the halachah does not follow Rabbi Yose nor, Rabbi Eliezer] . ”
