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This explorative study examines the applicability of Morality-as-Cooperation (MAC) theory to early Christian texts, using the Sermon on the Mount as a test case. MAC theory posits seven universal moral domains – family values, group loyalty, reciprocity, heroism, deference, fairness, and property rights – as evolutionary solutions to cooperative challenges. Five participants annotated 102 preselected Koine Greek text units from the Sermon using ATLAS.ti, classifying them according to MAC categories. The data were analyzed computationally. The results indicate that the moral domains proposed by MAC theory are widely represented in the Sermon, with reciprocity and deference emerging as the most prominent. However, substantial divergence among annotators’ interpretations suggests that the metaphorical and ambiguous nature of historical religious texts may contribute to interpretive variability. Addressing this issue will be essential before annotation-based methods can be reliably integrated with machine-learning models in broader studies of early Christian textual corpora.