It was during the time of Omar Ibn AbdulAziz. I looked up the reference, and it was actually not just income from Zakat, but the entire fund in Iraq was overflowing, so much so that it was not only sufficient for the needy, but it also paid off people's debts, and married whomever wanted to get married.
[1] https://www.islamweb.net/ar/fatwa/181283/%D8%A3%D8%AB%D8%B1-...