BT BM 107b(41) :לא תזלזל במשחתא, דכל פורתא חזי לכורכמא רישקא‏ : do not treat (your job of) surveying lightly, for every part is suitable for saffron resin
See the entire entry for zll vb. to be of little value

BT BM 107b(41) :לא תזלזל במשחתא‏ : do not treat surveying lightly
See the entire entry for mišḥā, mišḥəṯā n.f. measurement