GT AA Num19:9 :למטרא למי הדיא‏ : for safekeeping for the sprinkling water
See the entire entry for maṭṭrā, maṭṭartā n.f. custody, care

GT AA Num19:9 :ויצנע יתה לבר מן משריתא‏ : he must place it outside the camp
See the entire entry for ṣnˁ vb. D to act guilefully; C to put aside