Tobit 1:8

When I was young, my father died and left me as an orphan. So it was my grandmother Deborah who told me to be careful and obey what the Law of Moses commanded about taking care of orphans and widows and of those who had come from other countries to become part of Israel. That's why every third year, I would set aside a third tenth of my harvest and use part of it to hold a festival for them. Then I would give them the rest.