What is the ruling on praying behind an Imam who is pious, a memorizer of the Quran, constantly engaged in remembrance and seeking forgiveness, of good character, and knowledgeable of the Sunnah, but sometimes watches pornographic websites?

The glory of a servant lies in obeying his Lord, and his humiliation in disobeying Him. Sins are a cause of affliction, while obedience is a gateway to inner peace and a happy life. The advice is:

1. Leave the lands of disbelief and return to the lands of Islam: It is not permissible for a Muslim to reside in the lands of disbelievers unless there is a necessity (such as knowledge that Muslims need, or for inviting to Allah). 2. Stop watching pornographic websites: Because they contain forbidden, indecent images. Utilize one's life for good deeds before death. 3. Maintain congregational prayers in mosques: This is obligatory for free, adult men unless there is a valid excuse. If there is no nearby mosque, strive to build one. It is permissible to pray behind the person mentioned, but it is better for someone not known for sins to lead you in prayer. Your prayers are valid. The brother mentioned is advised to fear Allah and combat his desires.