TT #142 · Parashas Shoftim · Third Aliyah · Passuk 18:04
The first of your grain, your wine, and your oil, and the first of the fleece of your flock, you shall give to him.
Torah Temimah points to Chullin 135a.
TT lemma: וְרֵאשִׁית גֵּז צֹאנְךָ.
English: ‘And the first of the fleece of your flock you shall give to him’ – this is the first of the shearing.
Derash identifying the fleece gift (Bavli) — the verse creates the separate obligation of reshit ha-gez.
The first shearing of the flock is given to the kohen as a distinct gift.