Spiritual Mental Strengthening of Santri Through the Concept of Tazkiyatun Nufus at Daarun Nahl Cilegon, Banten, Indonesia.

Strengthening the spiritual and mental aspects of students in Islamic educational institutions is crucial in the face of contemporary challenges. This study examines the implementation of the concept of tazkiyatun nufus (soul purification) in strengthening the mental and spiritual well-being of students at Rumah Tahfidz Daarun Nahl Cilegon, Banten, Indonesia. Using a qualitative case study approach with in-depth interviews, participatory observation, and documentation, this research explores how soul purification practices-including dzikr (remembrance of God), muraja'ah (Qur'anic review), character mentoring, and daily worship-contribute to emotional stability, inner peace, patience, and harmonious social relationships among students. The findings indicate that the implementation of tazkiyatun nufus-based spiritual formation significantly strengthens students' mental resilience while creating a positive educational environment free from bullying. Supporting factors include conducive educational environment, teacher exemplarity as murabbis (spiritual guides), and institutional commitment to embedding tazkiyah values in daily activities. This study contributes to the development of Islamic education theory and provides practical recommendations for educational institutions seeking to integrate soul purification concepts into student character development.