Imam Yahya ibn Sharaf al-Nawawi (1233-1277 CE), a Syrian scholar renowned for his commentary on Sahih Muslim and his legal writings, compiled a small, focused collection popularly known as An-Nawawi's Forty Hadith (actually forty-two in most editions, since he added two extra reports to round out the coverage). Rather than aiming for comprehensiveness, Nawawi selected hadith that together summarize the essential creed, worship, ethics, and daily conduct expected of a Muslim, choosing reports he judged to be authentic and foundational rather than obscure or narrowly legal. It opens, fittingly, with the hadith on sincerity of intention, 'actions are judged by intentions,' emphasizing that the collection is meant as a starting point for character and devotion, not a specialized legal manual. Because of its brevity and clarity, it became one of the most widely memorized and taught texts in Islamic education worldwide, often assigned to students as their very first formal introduction to hadith study, and it remains in print with countless translations and commentaries eight centuries later.
Q&A · Hadith
What is An-Nawawi's Forty Hadith, and what was its purpose?
References
Sahih al-Bukhari 1
Informational, not a personal fatwa. Consult a qualified scholar for rulings on your situation.