Is the Hadith, "If you see a man frequenting the mosques, then bear witness to his faith," authentic or weak, taking into consideration its apparent contradiction with the noble verse: {The Bedouins say, "We have believed." Say, "You have not believed, but say, 'We have submitted,' for faith has not yet entered your hearts"}?

The hadith narrated by Al-Tirmidhi, Ibn Majah, and Al-Darimi from Darraj ibn Sam'an has been a subject of scholarly disagreement. Some scholars, such as Al-Tirmidhi, Ibn Khuzaymah, Ibn Hibban, and Al-Hakim, deemed it authentic. Others, like Imam Ahmad, Abu Dawud, Al-Dhahabi, Al-Albani, and Al-Arna'ut, considered it weak.

As for bearing witness to the faith of a person who prays in the mosque, there is no harm in it if the hadith is authentic. The meaning of "bear witness to his faith" is that he is truly a believer in outward appearance.

The noble verse (قَالَتِ الْأَعْرَابُ آمَنَّا قُل لَّمْ تُؤْمِنُوا وَلَكِن قُولُوا أَسْلَمْنَا) means the Bedouins who submitted out of fear and did not truly believe in their hearts. If signs of faith and good deeds are apparent in a person, there is no objection to bearing witness to that.