Yerushalmi Nazir 9:6 ירושלמי נזיר ט׳:ו׳

MISHNAH: Samuel was a nazir following the words of Rebbi Nahorai, as it is said: “A shaving knife shall not come on his head¹⁸⁷1S. 1:11..” It is said about Samson “a shaving knife¹⁸⁸Jud. 13:5”, and it is said about Samuel “a shaving knife”. Since “a shaving knife” mentioned for Samson refers to nazir¹⁸⁸Jud. 13:5, so “a shaving knife” mentioned for Samuel refers to nazir. Rebbi Yose said, but fear¹⁸⁹Reading מוֹרָא (root ירא) “fear” for מוֹרָה (root possibly مار) “shaving knife”. is only of flesh and blood! Rebbi Nahorai answered him: Was it not said: “Samuel said, how can I go? Will not Saul hear of it and kill me?¹⁹⁰1S. 16:2.” The fear¹⁹¹In most Mishnah mss., the reading here also is מוֹרָה. of flesh and blood already was on him.

HALAKHAH: Rebbi Yannai said: It is written¹⁹²Is. 7:25.: “To all the hills which are to be worked by the harrow the fear of worm¹⁹³A rock-splitting worm used by King Solomon to quarry the stones for the Temple without iron implements (Soṭah 9:13/14, Note 219.) and snail will not come.” Just as the stalk fears the iron, so the hair fears the iron¹⁹⁴For him, מוֹרָה also is derived from the root ירא..