Rashi on Exodus 35:26/רש"י על שמות ל״ה:כ״ו

1טוו את העזים [AND THE WOMEN] SPUN THE GOATS’ HAIR (lit., the goats) — This required extraordinary skill, for they spun it (the goats’ hair) from off the backs of the goats (whilst it was still on the living animals) (Shabbat 99a).