If your work in the bank does not include editing deals that involve interest or participating in forming such contracts by being a party in the deal, then working in banks is permissible. The cash bills that you receive from the government from such work as salary if they were previously owned by muslims, are called â€œMajhool Al-malikâ€. The religious obligation on it is to receive it with the intention of being on behalf of His Eminence (may Allah grant him a long life), and then intend to own it.
It is obligatory on every individual to pay the fifth of his/her net profit that remains at the end of the khums year, whether these profits were silver or gold coins, or in the form of bars, and whether the profits were real estates or other kind of assets.
Repentance is regret and determination to avoid committing sins in the future. Being in the state of purity, prayers or fasting is not part of it. Yes, it is recommended to repeatedly seek forgiveness whenever sins are remembered. A devotee is expected to have high hope in Almighty Allah’s acceptance of the repentance and the forgiveness of sins. Almighty Allah said: “O my slaves who have been prodigal to their own hurt! Despair not of the mercy of Allah, Who forgives all sins. Lo! He is the Forgiving, the Merciful.” (39:53).