Kabbalah zu Bamidbar 11:18

From this we see that when a Chassid is occupied in the study of Torah or in performing the mitzvoth or in good character traits; if even a hint of motivation to receive a reward is mixed into it, he is a Chassid for himself, as in the verse⁴⁸Proverbs 11:17, “A man of kindness (Ish Chessed) brings goodness upon himself.” This is because when he fulfills the mitzvoth he brings goodness upon himself. Therefore, he is called a “Man of Chessed” rather than a “Chassid”, because he does himself the kindness. Only a person whose sole motivation is to do a kindness to his Master can be truly called a “Chassid” and a “Holy Man”. This is because he has become purified from all impurities and has sanctified himself in G-d’s holiness, Blessed is He. We find that the term קדושה-Kedushah (holiness) means “preparation”, as in the verse⁴⁹Numbers 11:18, “Prepare⁵⁰ The word here for “prepare yourselves” is Hitkadshoo-“sanctify yourselves” (התקדשו).yourselves for tomorrow and you shall eat meat”. This is because such a person makes himself the vehicle for G-d’s holiness, Blessed is He. As mentioned above, rather than caring about his own glory, he only cares about his Master’s glory.