BT Pes 30b(17) :כעין חדתת̇א̇ קאמינא, פרזליהי בנורא וקתיהי בטינא‏ : I am talking about something like new ones: their iron blades go into the fire while their handles go into the clay
See the entire entry for ṭīn, ṭīnā n.m. clay, mud