The fifth Commandment serves as a vital bridge between the duties owed to God, which define the first half of the Ten Commandments, and the obligations people have toward one another in the second half. The primary approach among commentators is that this placement is deliberate. Parents are considered partners with God in the creation of a human being; the Creator provides the soul, while the parents provide the physical body. Because of this partnership, recognizing the good done by parents who brought a person into the world and raised them naturally leads to gratitude and respect for the Creator Himself [רמב״ן, כלי יקר, ספורנו, קאסוטו]. Furthermore, parents act as the essential link that passes down tradition, history, and faith to their children, thereby securing the eternal survival of the nation [רש ר הירש].
The requirement to honor one's parents demands treating them with the respect owed to a distinguished and important person [שד״ל]. Many commentators explain that this translates into practical obligations, such as caring for their physical needs by providing food, drink, clothing, and an escort. A child is even expected to spend personal funds to fulfill this duty, much like the obligation to honor God by giving charity and tithes [רבנו בחיי, תורה תמימה, צאינה וראינה]. Beyond physical acts, this honor requires a deep moral and internal commitment. A person must never disown their parents, serve them merely in hopes of a future inheritance, or swear falsely by their lives [רמב״ן]. By mentioning the father and mother together, the Torah teaches that both parents are absolutely equal in their right to receive honor and reverence, a duty that the sages also extended to older siblings and stepparents [תורה תמימה, רש ר הירש].
This mandate stands alone among the Ten Commandments as the only one with an explicit reward attached. The assurance of prolonged life is understood on several levels. At its most basic, it operates as a measure for measure: one who honors those who gave them life will be granted additional life in return [קאסוטו, מלבי״ם]. Others view this as a dual promise, guaranteeing a long life in this world and eternal existence in the World to Come [רמב״ן, הטור הארוך, ספורנו]. Alongside the promise of divine reward, there is a practical and psychological insight. Caring for aging parents can be a heavy and ongoing burden. By assuring a person that this effort earns them a longer life, they realize that their hard work is ultimately an investment in their own future [רבנו בחיי בשם רב סעדיה גאון]. Additionally, a person who cares for their aging parents sets a powerful example for their own children, who will learn from these actions and honor them when they too reach old age [אברבנאל, קונטרס חיבה יתירה, תולדות יצחק]. Another perspective suggests that out of deep gratitude, the parents themselves will pray for the long life of the child who tends to them [פענח רזא, הדר זקנים]. Conversely, the central approach among most commentators is that this promise of reward carries an implied warning, meaning that failing to honor one's parents will result in a shortened life [רש״י, מזרחי, משכיל לדוד].
The promise of long life extends beyond the individual to the entire nation. The assurance of remaining securely on the land indicates that honoring parents is a fundamental guarantee of social stability. Fulfilling this duty ensures that the Israelites will not be exiled from their homeland [אבן עזרא, שד״ל, רש ר הירש]. A society that provides dignity, meaning, and security to its older generation is a healthy society that will endure [ביאור שטיינזלץ]. Finally, while the obligation to honor parents applies in all times and places, the primary abundance and reward promised for fulfilling it are most profoundly realized in the Land of Israel [העמק דבר, ברכת אשר].