Cognitive semantics examines meaning by relying on the human mind's information processing and categorizing linguistic concepts. In this method, words and especially letters carry the main meaning. Each main meaning is connected with secondary meanings and creates a radial network. Therefore, the letters in the texts, especially in the Qur'an, gain meaning according to the context. The primary meaning of the letter "ba" in the Holy Quran is attachment, from which other meanings of causation, help, emphasis, confrontation, modification and swearing can be derived. Using a descriptive-analytical method, the present study evaluates the uses and meanings of the letter "ba" in Surah Ma'idah in the Persian translations by Makarem Shirazi, Foladvand, and Elahi-Qomshei. According to the findings of the present research, these translators have focused mostly on the original and common meaning of the letter in the semantic network, i.e., attachment and superiority. The reason for this claim is that, for example, they did not convey the exact meaning regarding emphasis, and in most cases, instead conveying the emphatic meaning, they chose the traditional equivalent of "to", conveying the concept of attachment.