בראשית, פרק כ״ז, פסוק כ״ו

In the tense moments before bestowing his blessings, Isaac calls his son close. His request for a kiss carries a dual layer of emotion and suspicion [ביאור שטיינזלץ]. On one hand, the gesture stems from deep affection, reflecting a father's desire to bless his son willingly and with a complete heart [שד״ל].

However, the primary approach among commentators is that this request is a calculated test. Isaac is torn by contradictory evidence: he hears the voice of Jacob, but he feels the hands of Esau. To resolve this doubt, he needs a third, tiebreaking sign, which is the sense of smell. Knowing that Esau carries the distinct scent of the outdoors, while Jacob does not, Isaac asks his son to come close. This proximity allows him to smell the garments, intending to make his final decision based on the majority of the evidence [הטור הארוך, בכור שור, שד״ל].

A subtle dynamic is at play in how the request is made. Normally, an older figure initiates a kiss with a younger one. Yet, Isaac asks his son to kiss him. This reversal is due to his physical limitations. Because he is blind, attempting to kiss his son would require him to grope and feel around. Therefore, he must rely on his son to step forward and initiate the embrace [רד״ק].