Musar zu Könige II 5:30

And with all his thoughts he should meditate how to do the will of the Creator, and purify the many others to do likewise, and to sanctify the Name of God and to surrender himself completely in the love of God, Blessed be He. And this is the love of God, Blessed is He, that is written in the Torah, as in the case of Phineas who risked his life for the sake of the Creator, may He be Blessed (Num. 25), and as in the case of Abraham, our father, who said: "I have lifted my hand to the Lord, the most High God, Creator of heaven and earth, that I will not take from a thread or a shoestring nor will I take anything of yours" (Gen. 14:22-23). And, as in the case of Elisha who did not wish to take anything from Naaman (II Kings 5:16).