This study aimed to analyze the effect of implementing the tazkiyatun nafs learning method on the development of moral reasoning and students’ affective character in elementary schools. The research employed a quantitative research approach with a pretest-posttest design involving 45 respondents in Rokan, Riau, Indonesia. Data were collected through Likert-scale questionnaires, observations, and documentation, and analyzed using a paired sample t-test, correlation analysis, and N-Gain calculation. The results showed a significant improvement, with the mean pretest score of 2.96 (59.2%) increasing to 4.10 (82.0%) in the posttest, with a gain of 22.8%. The t-test result indicated a value of 9.87 > 2.015 with a significance level of 0.000, while the correlation coefficient showed a strong relationship at r = 0.82. The N-Gain value of 0.56 was categorized as moderate to high. Therefore, the tazkiyatun nafs method is effective in significantly improving students’ character development. These findings imply that integrating the tazkiyatun nafs learning method within elementary school curricula can serve as an effective pedagogical strategy for strengthening students’ moral reasoning and affective character, while providing educators and curriculum developers with an evidence-based approach to implementing holistic character education.
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