Related על תרומות 2:3

One who separates terumah and tithes on Shabbat, whether unwittingly or intentionally, his tithes are [valid] tithes, and one who immerses [impure] utensils on Shabbat, whether unwittingly or intentionally, the immersion counts (contra Ter. 2:3 [invalidating intentional tithing and immersion on Shabbat]).