Imam Nawawi's Forty Hadith (Al-Arba'in Al-Nawawiyyah) is the most famous collection in this genre. Many scholars have added 10 additional hadith to complete the set to fifty (making it Khamsuna ).

Here is a story of a young scholar's quest for this "exclusive" knowledge. The Weaver of Fifty Threads

In the vast ocean of Islamic literature, few texts bridge the gap between rigorous scholarship and public accessibility as beautifully as the Khamsuna Hadith (Fifty Hadith). For decades, students of knowledge have sought comprehensive, authentic, and well-organized collections of the Prophet Muhammad’s (PBUH) sayings.

One rainy evening, an old librarian handed him a weathered leather pouch. "The PDF—the Pithy, Devotional Fragments —you seek are not just words on a page," the old man wheezed. "They are threads. If you weave them together, they form a cloak that protects the heart."

The (Fifty Hadiths) is a popular Islamic compilation that expands upon the foundational "Forty Hadiths" tradition. While several scholars have curated collections of 50 hadiths, the most prominent version often associated with this title is an expansion of Imam al-Nawawi's 42 Hadiths