Musar su I Samuele 21:11

Therefore when a person has guests in his home let him be sure to serve them a generous portion or let him not invite them at all, lest he be punished as above, Heaven forbid. For it is likely that the host will be required to repent over the matter. In this light we can understand the meaning of the verse, “A righteous person eats to the satiation of his soul but the belly of the wicked is lacking” (Mishlei 13:25). For whoever partakes of the food of someone with a generous eye eats to the satiation of his soul, even if the quantity of what he eats is small. But one who partakes of food from the “belly of the wicked” will feel a lack, for even if the quantity of what he eats is great it will not satiate him. The principle is that a miserly individual cannot even satiate his own soul, let alone give of the blessings Hashem has bestowed upon him to others. Thus we find that Naval (I Shmuel 21:11) was unwilling to send a portion of what he had slaughtered to Dovid HaMelech. Through this he brought evil upon himself, for he was stricken down by plague on this account (ibid. 38). Therefore a person must distance himself from this trait and then he will enjoy goodness, selah.