If a person is unsure whether they have fulfilled a religious obligation, they can verify by:

1. **Consulting Religious Texts:** Review the Quran and Hadith to understand the requirements and conditions of the obligation.

2. **Seeking Guidance from Scholars:** Ask knowledgeable scholars or trusted community leaders for clarification and advice regarding the obligation in question.

3. **Self-Reflection:** Reflect on their actions and intentions to assess whether they followed the proper procedures for fulfilling the obligation.

4. **Community Input:** Discuss with fellow community members who may have insights or similar experiences regarding the obligation.

5. **Performing the Obligation Again:** If still in doubt, it may be advisable to perform the obligation again to ensure it is fulfilled properly.

These steps can help provide clarity and assurance regarding their religious duties.