Jami` at-Tirmidhi, Volume 2, Book 5, Hadith 678 (DarusSalam) ⓘ
Ali narrated: "Al-Abbas asked the Messenger of Allah about paying his charity (Zakat) in advance before its time is due (by being in possession for a whole year), he permitted him to do that."
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ، أَخْبَرَنَا سَعِيدُ بْنُ مَنْصُورٍ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ زَكَرِيَّا، عَنِ الْحَجَّاجِ بْنِ دِينَارٍ، عَنِ الْحَكَمِ بْنِ عُتَيْبَةَ، عَنْ حُجَيَّةَ بْنِ عَدِيٍّ، عَنْ عَلِيٍّ، أَنَّ الْعَبَّاسَ، سَأَلَ رَسُولَ اللَّهِ صلى الله عليه وسلم عَنْ تَعْجِيلِ صَدَقَتِهِ قَبْلَ أَنْ تَحِلَّ فَرَخَّصَ لَهُ فِي ذَلِكَ .
also referenced under: Hadith 678 (Reference) & Book 7, Hadith 62 (In-Book)