It is interesting that this matter has been mentioned it...
It is interesting that this matter has been mentioned it Ahadith of Shi’aa and Ahlul Sunnah; we read in a Hadith from Imam Sadiq (a.s.) that a group of people from Bani Hashim came to Prophet (S) and asked his holiness to launch them in the duty of collection Zakat of four-footed animals and they said we deserve more for this share which Allah has specified for collectors of Zakat; Prophet (S) said: Bani Abdul Muttalib!
Zakat is not Halaal (permitted) neither for me nor you, but I promise my intercession in change of this deprivation … you should be satisfied of thing s which Allah and your Prophet have specified for you (and do not deal with Zakat)! They said we got satisfied.[^4] It is well understood from this Hadith that Bani Hashim had known this matter as a deprivation for themselves and the Prophet (S) promised them the intercession in change.
We read a Hadith in “Sahih of Muslim” which is one of most famous books of Ahlul Sunnah that briefly says “Abbas” and “Rabi’a ibn Harith” came to Prophet (S) and asked him that their sons who were two young persons called “Abdul Muttalib ibn Rabi’a” and “Fazl ibn Abbas” to be the collectors of Zakat and take a share like others in order to provide the costs of their marriages, Prophet (S) denied that and ordered that their means of marriage to be provided from another way and Mahr to be paid from Khums.[^5] It is also understood from this Hadith which is too long with details that Prophet (S) insisted that prevent their relatives from achieving Zakat (public assets).
It cleared from the things which we said that Khums is not only considered as an advantage for Sadat, but it is a kind of deprivation in order to save public benefits.
[^1]: The proofs of this matter that Bani Hashim dynasty have been prevented from taking Zakat are lots of cabbalas which have been quoted in Shiites’ and Sonnies’ books, and these cabbalas are so much that no place for any kind of doubt will remain, and denying these cabbalas is equal to denying self evidence matters; for information about these cabbalas in Shiite resources you can refer to the book Wasael Al-Shi’aa, vol.
6, chapter 29 from chapters of “people who deserve Zakat”, first, second, third and fourth Hadith. And Also chapter 30, first Hadith; chapter 31, third Hadith; chapter 32, third, fifth, sixth, seventh and ninth Hadith; chapter 33, first Hadith and chapter 34, fourth Hadith.