daf bit: Chillin 137

[cellio]

The mishna discusses the law of the first fleece (that is, the first shearing), which is owed to the kohanim. The mishna says this law applies only when there are "many" sheep. What is "many"? Beit Shammai says two; Beit Hillel says five. The g'mara attempts to explain these positions. Shammai says two because two sheep are referred to as a "flock", and Hillel (apparently) says five because of an account in Samuel where five sheep are brought. (135a mishna, 137a g'mara)
(I don't follow the latter reasoning.)