The act of raising one's hands serves as a profound physical expression of spiritual elevation, blessing, and prayer. Reaching upward in a state of holiness is the natural posture of those who offer blessings [מצודת דוד]. The exact nature of this gesture is understood in different ways. It can be viewed as a direct reference to the Priestly Blessing, where priests elevate their hands during the day to bless the people [אבן עזרא, רד״ק]. Alternatively, it carries a broader meaning, representing the general act of raising one's hands to God during prayer [רד״ק, מאירי]. From a practical standpoint, this imagery provides the basis for specific laws, establishing the requirement for a priest to wash his hands before offering the blessing, and dictating that a cup used for a blessing must be held with both hands [תורה תמימה].
The concept of holiness accompanying this gesture operates on multiple levels. Geographically, it implies raising the hands either within a holy place or directing them toward it [רד״ק, ביאור שטיינזלץ, מאירי]. Beyond physical location, it describes a necessary state of mind, instructing a person to lift their hands in total purity and with excellent intention [מאירי].
A deeper moral requirement is also woven into this call for holiness. The physical gesture is only accepted if the hands are entirely free from sin, wrongdoing, or theft. When a person approaches prayer with moral cleanliness, they are assured an immediate response from Heaven. In this state of moral perfection, simply offering a blessing to God is enough to be answered, even before any personal requests are voiced [אלשיך].
On a more abstract and philosophical level, this call is not directed at physical hands at all. Instead, holiness itself is imagined as an abstract entity reaching upward. It is a challenge for a person to transcend the material and natural world through the power of their intellect and soul. By living a life of holiness, a person effectively raises spiritual hands to the higher realms, drawing down abundance, divine favor, and blessing into the world [מלבי״ם].