Muslim

Hadith Commentary:
Benefits and Issues:
If a person performs a good and righteous deed, and in his intention there is not solely the attainment of Allah Almighty’s pleasure and approval, but rather he seeks to please someone else or to gain some other benefit,
then Allah Almighty leaves his deed for the one he associated with Him;
He does not grant it the honor of acceptance in His court, or He refers that person to his act of association (shirk), and that person gradually turns away from Allah Almighty,
meaning he becomes captive only to his own interests and to pleasing others,
therefore, the word shirk can be used both in the verbal noun sense (i.e., the act of associating partners) and in the sense of a partner (i.e., the one with whom association is made).

Benefits and Issues:
➊
To associate someone else means to perform an act for show, through which worldly benefit is sought or so that one may be called pious and righteous in the eyes of people.

➋
Such an act is not accepted by Allah.

➌
If an act is done for someone else, it means that Allah does not grant any reward for it.
If the ostentatious person seeks reward, then let him take the reward from the person for whom he performed the act to show off.
Obviously, a human being cannot give another human being the recompense for good deeds, so on the Day of Resurrection, the ostentatious person will be humiliated.
And he will receive no reward or benefit for his deed.

➍
Ostentation (riya) is minor shirk (shirk asghar); it destroys the act in which ostentation is present. However, it is not major shirk (shirk akbar), the punishment for which is eternal Hell.