Al-Abbas asked the Prophet (ﷺ) about paying the sadaqah (his zakat) in advance before it became due, and he gave permission to do that.

Abu Dawud said: This tradition has also been transmitted by Hushaim through a different chain of narrators. The version of Hushaim is more sound.
Sunan Abi Dawud Book 9, Hadith 69
← Previous Hadith The Prophet(ﷺ) sent Umar b. al-Khattab to collect sadaqa (All the people paid the zakat but ibn-jamil, Khalid b. al-walid and al-abbas refused. So the Messenger of Allah(ﷺ) said : Ibn-jamil is not (so much) objecting, but he was poor and Allah enriched him. As for Khalid b. Walid, you are wronging him, for he has kept back his courts of mail and weapons to use them in Allah’s path. As for al-Abbas, the uncle of the Messenger of Allah(May peace be upon him), I shall be responsible for it and an equal amount along with it. Then he said did you not know(Umar) that a man’s paternal uncle is of the same stock as the father or his father?

Sunan Abi Dawud Book 9, Hadith 68 Next Hadith → Ziyad, or some other governor, sent Imran ibn Husayn to collect sadaqah (i.e. zakat). When he returned, he asked Imran: Where is the property? He replied: Did you send me to bring the property? We collected it from where we used to collect in the lifetime of the Messenger of Allah (ﷺ), and we spent it where we used to spend during the time of the Messenger of Allah (ﷺ).

Sunan Abi Dawud Book 9, Hadith 70