Related zu Shabbat 3:10

One who skims [wine] off [the top of] a trough, or skims [wine] off a vessel -- it may be put on a cake or on a large plate (see Maasr. 1:7). One who pours [wine] out from [one] vessel for heating liquids to [another] vessel for heating liquids, from stew-pot to stew-pot, or from pot to pot -- it is permitted to put it on the second, but forbidden to put it [back] on the first.