Q 1: I was working in a laboratory specialized in pork for six months. When the money I got from this job reached the Nisab (the minimum amount on which Zakah is due) and a Hawl (one lunar year calculated from the time a property reaches the minimum amount upon which Zakah is due) passed on it, I paid the due Zakah (obligatory charity). I worked in another laboratory and I mixed the lawful money I received from this job with that I earned from the other one. I now pay Zakah on the whole sum. (Part No. 11; Page No. 166) When I was working in the first laboratory, I was astray as I did not perform Salah (Prayer) or observe Sawm (Fast), then I repented to Allah (Glorified and Exalted be He).What is the ruling on this mixed money? Should I pay Zakah on all of the money? I do not know the exact sum of money which I earned from the first job and this is why I pay Zakah on all of it. Is the following Hadith: Islam wipes out all that has gone before it (previous misdeeds), applicable to me? Please advise me, may Allah reward you.