Could it be hurtful for one to answer this or is this place void of Sotapannas or advanced?
Of course he/she couldn't reject and if spoken of "hurt oneself" means that it would require to break the precepts, since such is understood as hurtful for oneself.
Having abounded all kind of maccharia and void of ingratitude (having won firm faith in kamma), with the attaining of the path, a person is unable to reject a request that does not require to hurt whom ever knowingly (e.g. goes against the precepts)
"And what is the treasure of generosity? There is the case of a disciple of the noble ones, his awareness cleansed of the stain of stinginess, living at home, freely generous, openhanded, delighting in being magnanimous, responsive to requests, delighting in the distribution of alms. This is called the treasure of generosity.
That being the reason, Bhikkhus are restricted in accepting alms form those "fit to training" to avoid that families would grow poor. More in an "alien" sphere here.
(Note that it is not given for trade, exchange, stacks or what ever binds to this wheel here, but for higher and liberation)