Midrash for Numbers 6:2

(Fol. 9b) We are taught in a Baraitha that Simon the just said: "I never ate a trespass-ofering of a Nazarite except one. It once happened that a Nazarite came to me from the South, and I observed that his eyes were beautiful, with a becoming appearance, and his locks arranged in curls. I then said to him: 'What made you consider destroying this, your beautiful hair?' Whereupon he answered me: 'I was a shepherd for my father, where I lived, and I once went to fill water from the well. [I was looking at my image in the water, causing my evil inclination to arise within me in pride of my beauty;] he wanted to drive me out of the [moral] world. I then said to him: Thou wicked one, why art thou exulting in a world which is not thine, with something that is destined to become worms. I swear that I shall shave you off for the sake of Heaven.' I immediately got up and kissed him on his head, saying to him: 'My son, I wish many Nazarites like you would multiply in Israel. Concerning your action the passage reads (Num. 6, 2) When a man pronounces an especial vow, the row of a Nazarite, to be abstained in honor of the Lord.' " R. Mani raised the following objection: "Why did not Simon the Just eat the offering of a Nazarite? Is it not because it was brought as a consequence of a sin? If so, then all the sacrifices of a Nazarite ought not to be eaten, for they also come for a sin?" Whereupon R. Jona said to him: "It is because of this that he did not eat: Whenever persons lament their evil deeds they become Nazarites, and when they become unclean the Nazariteship increases to such an extent that they regret the entire thing, and the consequence is that they bring profane sacrifices m the Temple-court."