Related for Gittin 103:16

Rabbi Shimon ben Elazar says, [with respect to] orphans that were supported at the place of a landowner, or that were supported by their fathers [even though their fathers were not made their legal guardian (אפוטרופוס), see Minchat Yitzchak], or that were supported by the Beit Din, [those that support them] tithe [the produce that the orphans eat] and feed them for the sake of tikkun olam (the betterment of the world). And in the same way, Rabbi Shimon ben Elazar says, an orphan who is a Levite that was raised at the place of a landowner, [separates] tithes (מעשר not מעשה) and feeds him for the sake of tikkun olam. If [the orphan] was learning [a craft] at the place of a Levite or a Kohen or a poor person, behold, he should feed him out of that which is his (i.e., the landowner's). If he was the son of his wife who is a Kohen or Levite or poor person, behold, he feeds him from his (i.e., the orphan's) own portion.