בראשית, פרק ב׳, פסוק כ״ד

The bond of marriage stands as the most profound and primary connection in human experience, ultimately surpassing even the natural ties a person shares with their family of origin. There are different perspectives on who actually declares this enduring truth. Some suggest these are the words of the first man, who foresaw the future of humanity through prophetic vision, knowing he would eventually have children [רד״ק]. Others understand this as an editorial note from the Torah and Moses, establishing a timeless principle for all generations [שד״ל, קאסוטו]. A third, legalistic approach maintains that the Holy Spirit is the speaker. Because the first man had no parents, this declaration is not a description of his reality, but rather a command and a warning to all humanity against incestuous relationships [רש״י, גור אריה, מזרחי].

The transition away from one's father and mother does not imply ungrateful abandonment, the breaking of family ties, or a failure to honor one's parents. The primary approach among commentators is that this refers to a geographic and emotional shift. It involves stepping away from the childhood home and parental dependence to build an independent household and a new family. While the connection with the parents remains, the man's love for his wife grows to become the central focus of his life [קאסוטו, שטיינזלץ, מלבי״ם]. Practically, moving away from the parents' dwelling also helps prevent natural friction and arguments between the bride and her husband's family [נתינה לגר]. On a symbolic level, this departure serves as a prohibition against sexual relations with first-degree relatives. By stepping outside the nuclear family to choose a partner, individuals with different traits are brought together to complement one another, rather than amplifying the shared flaws that exist within a single family unit [רש״ר הירש, תורה תמימה].

The commitment to cleave to one's wife represents a deep emotional, spiritual, and intellectual bond. It points to complete harmony between partners, far beyond a mere physical connection. This relationship demands exclusive loyalty, strictly rejecting adultery, betrayal, or unnatural relations [ספורנו, הטור הארוך, קאסוטו]. Commentators highlight a sharp contrast between humans and animals in this regard. While animals mate randomly and separate immediately afterward, humans are created as social beings who seek eternal partnership. This enduring devotion is the very foundation for building stable families, healthy societies, and functional nations [רמב״ן, שד״ל].

There are two main approaches to understanding how a couple physically and spiritually merges into a single entity. One perspective explains that this unity is realized in a shared child, who is formed from the union of both parents and literally merges their flesh [רש״י, אברבנאל, צרור המור]. Although animals also produce offspring, human reproduction is unique because it establishes a lasting family lineage, and humans are entirely incapable of reproducing with other species in nature [גור אריה, מזרחי, דברי דוד]. The second approach views this concept as the complete, holistic unification of the couple themselves. Because the first woman was originally formed from the man's own body, a couple striving for wholeness is effectively returning to their original, unified state. In this ideal dynamic, both partners act with a single will and shared intention. They practice mutual compromise, subordinating their individual desires to a higher spiritual purpose, functioning as a single entity with a united heart and spirit [רמב״ן, ספורנו, רד״ק, רש״ר הירש, העמק דבר].