al-Harith bin 'Abdur Rahman الحارث بن عبد الرحمن بن عبد الله · The Book of Zakah

"We used to fast on 'Ashura and give Zakatul-Fitr, and when the command to fast in Ramadan was revealed, and the command to give Zakah was revealed, we were neither commanded to give it, nor told not to do so, and we used to do it."