Paying Zakaah in Advance:
`Alee (radiyallaahu `anhu) narrated that Al-`Abbaas (radiyallaahu `anhu) asked the Prophet (sallallaahu `alaihi wa sallam) if he could pay his Zakaah before one year had passed over his wealth, so he allowed him to do that.
Authenticated by Ibn Khuzaimah (2331), Al-Haakim (3/332), and Adh-Dhahabee agreed, Al-Baghawee (Sharh-us-Sunnah, 3/339), An-Nawawee (Al-Majmoo`, 6/144), Ahmad Shaakir (Musnad Ahmad, 1/104), Al-Albaanee (Al-Irwaa’, 857; Saheeh Abee Daawood, 5/327-328; Hidaayat-ur-Ruwaah, 1728; Saheeh Ibn Khuzaimah, 2331), Shu`aib Al-Arna’oot (Musnad Ahmad, 822; Sunan-ud-Daaraqutnee, 2008), Husayn Asad (Musnad-ud-Daarimee, 1676), Al-Huwainee (Ghawth-ul-Makdood, 360), Az-Zuhairee (Buloogh-ul-Maraam, 611; Al-`Umdat-ul-Kubraa, 348), Anees Taahir (Mukhtasar-ul-Ahkaam, 3/290) and others.
Ibn Hajar indicated its authentication. (2/130).