Hadith #4455 (Sahih al-Bukhari)
Book: Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh))
Narrator(s): Khãlid bin Aslam
Grade: Sahih

We went out with ‘Abdullãh bin ‘Umar and he said, “This (Verse) was revealed before the prescription of Zakat, and when Zakãt was prescribed, Allah made it a means of purifying one’s wealth.”

Source: https://parallelquran.com/hadith/sahih-al-bukhari-4455/