PJ Num16:2 :וקמו בחוצפא ואורו הילכתא באנפי דמשה על עיסק תיכלא‏ : they audaciously went and taught the law regarding tekhelet in Moses’ presence
See the entire entry for ḥṣup̄, ḥuṣpā n.m. audacity

PJ Num16:2 :וקמו בחוצפא ואורו הילכתא באנפי דמשה על עיסק תיכלא‏ : they arose audaciously and had a legal discussion with Moses over the matter of the purple thread
See the entire entry for yry vb. C to teach