The Holy Qur'an in the use of vocabulary, although advanced on the basis of the age of revelation, but it is carefully stated that it has been developed in the literal sense of the word. And this semantic development in the singular words is such that the words with the semantic layers close together in their semantic domain communicate closely and precisely with each other, and the accuracy in applying the word and discovering the relation between them makes the individual It gives a closer understanding of the meaning of the Qur'anic theologian. Among these words is the vocabulary of Sadr, the heart and the foad. This research is careful in applying this word in the context of verses and in the context of "textual analysis" in the science of "semantics" with a "concurrent" approach and focuses on the conventional concepts of "Sadr" and "Heart" and "Fad" in the texts. Religion has explored the relationship between them. On this basis, one can say that Sadr is a forerunner of the human soul, and the first stage of dealing with things is done by him. After the intersection of the soul with the objects, the organ that cares about the human soul for the objects is its heart. And then if the heart attains an understanding of the reality of the object, it is interpreted as foad.
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