Background. The behavior of students is the result of the learning process and social interactions that take place during the education period. This behavior not only reflects an understanding of religious values, but also shows their ability to internalize and implement these teachings consistently in everyday life. Objectives. This study aims to: (1) analyze the extent of the influence of learning the Taisirul Kholaq book on the behavior of students at the Al-Hidayah Tahfidzul Qur’an Islamic Boarding School for Girls in Kediri City; (2) analyze the influence of peer interaction on the behavior of students in the same environment; and (3) analyze the simultaneous influence between learning the Taisirul Kholaq book and peer interaction on the behavior of students at the Islamic boarding school. Research Methods. This study uses a quantitative approach with an ex-post facto research type. The population in this study amounted to 40 respondents. The sampling technique used was saturated sampling, namely all members of the population were used as research samples. Data were collected through valid instruments and analyzed using statistical techniques to test the proposed hypothesis. Results and Conclusions. The results of the study revealed that: (1) learning the Taisirul Kholaq book has a significant influence on the behavior of students at the Al-Hidayah Tahfidzul Qur’an Islamic Boarding School for Girls in Kediri City; (2) interaction with peers has a significant influence on the behavior of students; and (3) learning the Taisirul Kholaq book and interaction with peers together (simultaneously) contribute significantly to the behavior of students.
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