Musar do Rodzaju 37:18

According to the Kabbalists the Heavenly objective was to wipe out the residual guilt of the brothers which had not been atoned for when they sold Joseph. We can find numerous allusions in our פרשה, which relate to the manner in which these Ten Martyrs were killed. According to tradition, Rabbi Yehudah ben Bava had three hundred לונכיות, lances, stuck into his body. The word ויתנכלו להמיתו, in 37, 18 is an allusion to this; the letters are simply a re-arrangement of the word לונכיות.