This study aims to analyze the concept of qalb (the spiritual heart) from the perspective of hadith and its relevance to character building in the digital era. The research employs a qualitative library research method. Primary sources include the main hadith collections such as Sahih al-Bukhari, Sahih Muslim, and Sunan al-Tirmidhi, along with their classical commentaries like Fath al-Bari and Sharh Sahih Muslim. Data analysis was conducted using content analysis through three stages: data condensation, data display, and conclusion drawing. The findings reveal that qalb serves as the spiritual center that determines the quality of intention, speech, and human behavior. Its relevance in the digital era is demonstrated through its role in developing self-control, emotional regulation, self-awareness (muraqabah), and spiritual intelligence, which serve as the ethical foundation for social media conduct. The purity of the qalb is influenced by internal factors such as worship, repentance, and intention, as well as external factors including education, social environment, and exposure to digital technology. The study concludes that nurturing the qalb based on prophetic hadith constitutes an essential foundation for character development among Muslims amidst the challenges of digital disruption.
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