The Master said, "A minister, in serving his prince, reverently discharges his duties, and makes his emolument a secondary consideration."
子曰、事君敬其事、而後其食。
Analects 15.38
The same idea in other traditions
And whatsoever ye do, do it heartily, as to the Lord, and not unto men; …
One who performs selfless service, without thought of reward, shall attain his Lord and Master. …
By doing service he acquires the Karman which brings about for him the nâman and gôtra of a Tîrthakara.
Caring for mother and father, kindness to children and partners, and unstressful work: this is the highest blessing.
Shema'iah and Abtalion received from them. Shema'iah said, Love work; and hate lordship; and make not thyself known to the government.
Your business is with action alone; not by any means with fruit. Let not the fruit of action be your motive (to action). Let not your attachment be (fixed) on inaction.
And they feed, for the love of Allah, the indigent, the orphan, and the captive,- (Saying),"We feed you for the sake of Allah alone: no reward do we desire from you, nor thanks.
The Prophet said, "To give one's wife the money she requires is more important than to give alms." … The celebrated saint Bishr Hafi said, "It is better that a man should work for wife and children than merely for himself." In the Traditions it has been recorded that some sins can only be atoned for by enduring trouble for the sake of one's family.