https://torontodawah.com/who-to-do-if-one-is-negligent-of-paying-zakah-in-the-money-how-to-pay-previous-years-worth-of-zakah-and-does-it-have-to-paid-all-at-once-shaykh-abu-abdir-rahmaan-yahyaa-bin-alee-al-hajooree-shayk/
What To Do If One Is Negligent Of Paying Zakah In The Previous Years, How To Pay Previous Years Worth Of Zakah, And Does It Have to Paid All At Once - Shaykh Abu Abdir Rahmaan Yahyaa bin Alee Al-Hajooree, Shaykh Bin Baz, Shaykh Muqbil bin Hadi al-Wadi'i, Shaykh Muhammad Nasiruddin al-Albani, And Shaykh Ibn Uthaymeen