Related על ביצה 34:7

One who immerses [unclean] vessels on Shabbat: If unwittingly, he may use them. But if intentionally, he may not use them. One who separates tithes, or cooks on Shabbat: If unwittingly, he may eat it. But if intentionally, he may not eat it. One who plants on Shabbat: If unwittingly, he may keep the tree. But if intentionally, he must uproot it. But if during the sabbatical year, whether [it was planted] unwittingly or intentionally he must uproot it.

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]).