Abdullah bin 'Abdur Rahman al-Daarimi عبد الله بن عبد الرحمن الدارمي · The Book on Zakat

the Prophet said: "Indeed there is a duty on wealth aside from Zakat."

"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."