If someone is unsure whether their income is earned in a halal (permissible) manner, they should consider the following steps to ensure its purity:

1. Seek Knowledge: Educate yourself about Islamic principles related to earning and financial transactions. Understanding the basics of halal and haram (forbidden) activities can provide clarity.
2. Consult a Scholar: Speak with a knowledgeable Islamic scholar or a financial advisor who specializes in Islamic finance. They can offer guidance specific to your situation.
3. Review Your Sources: Analyze the nature of your income sources. Ensure they align with Islamic principles, such as avoiding transactions involving interest (riba), gambling, or unethical practices.
4. Assess Your Employment: If you’re employed, evaluate whether your job’s nature and the company’s business activities are in accordance with Islamic teachings. If needed, consider alternatives or adjustments.
5. Correct Unethical Practices: If you discover any aspect of your income that may be questionable, take steps to correct it. This could involve changing your job, altering business practices, or finding halal alternatives.
6. Make Tawbah (Repentance): If you realize that some of your earnings have been from haram sources, make sincere repentance to Allah and seek forgiveness. Then, strive to make amends and ensure future income is earned in a halal manner.

Taking these steps can help ensure that your income is aligned with Islamic values and principles.