Why are hadith considered an authoritative source in Islam when they are not protected from corruption?

Hadith are considered an authoritative source in Islam despite concerns about their potential corruption for several reasons. First, the Qur'an itself emphasizes the importance of following what has been revealed and understanding the guidance it contains. Allah commands believers to reflect deeply on the Qur'an, stating: Will they not then ponder on the Qur'an? If it had been from other than Allah they would have found therein much incongruity. 4:82 This verse underscores the Qur'an's authenticity and the need for believers to engage with it thoughtfully.

However, the Hadith also play a crucial role in elaborating on the teachings of the Qur'an and providing context to the practices of the Prophet Muhammad ﷺ. The Prophet himself recognized the importance of preserving his teachings. For instance, he stated: "I said: 'O Allah's Apostle! Who will be the luckiest person, who will gain your intercession on the Day of Resurrection?' Allah's Apostle said: O Abu Huraira! 'I have thought that none will ask me about it before you as I know your longing for the (learning of) Hadiths. The luckiest person who will have my intercession on the Day of Resurrection will be the one who said sincerely from the bottom of his heart "None has the right to be worshipped but Allah.' And 'Umar bin 'Abdul 'Aziz wrote to Abu Bakr bin Hazm, 'Look for the knowledge of Hadith and get it written, as I am afraid that religious knowledge will vanish and the religious learned men will pass away (die). Do not accept anything save the Hadiths of the Prophet. Circulate knowledge and teach the ignorant, for knowledge does not vanish except when it is kept secretly (to oneself).' Sahih al-Bukhari 3:98

Additionally, scholars developed rigorous methodologies for verifying the authenticity of Hadith, which included examining the chain of narrators and the content itself. This scholarly effort helps to mitigate the risk of corruption.

While Hadith are indeed susceptible to error, the Islamic tradition maintains that those which are authentically traced back to the Prophet serve as a complementary source of guidance alongside the Qur'an. This dual-source framework is essential for understanding and practicing Islam.