After twenty years of separation, a highly charged encounter unfolds, marked by a dramatic gap in perception. The ruler of a vast empire stands before humble shepherds from Canaan, seeing clearly into their shared past and present, while they remain completely blind to the identity of the man holding their fate.
Joseph initially identified the men as a collective group before examining each brother individually [ספורנו, רמב״ן]. This recognition solidified as he listened to their voices and heard them calling out to one another by their Hebrew names [שד״ל, חזקוני, מלבי״ם]. To confirm his suspicions without raising alarm, he addressed them harshly, demanding to know where they came from. Only when they answered that they were from Canaan was his identification complete [אלשיך]. His task was also made easier because he was already expecting them, as border guards provided him with daily registries of everyone entering Egypt [תורה תמימה, פרדס יוסף].
The primary approach among commentators attributes the brothers' blindness to physical changes. Joseph had left them as a beardless youth and now stood before them as a mature man with a beard, whereas they had already been bearded adults when they last parted. As for the younger brothers like Issachar and Zebulun, who were closer to Joseph's age, he was able to deduce their identities the moment he recognized the older siblings [רמב״ן, טור הארוך]. Beyond physical changes, massive cultural and social barriers stood between them. Joseph was draped in royal garments, bore an Egyptian name, spoke through an interpreter, and likely adopted an Egyptian hairstyle and overall appearance [רשב״ם, חזקוני, ביאור יש״ר, שטיינזלץ]. Furthermore, strict royal protocols forbade commoners from looking directly into the face of the king, meaning the brothers likely kept their eyes lowered the entire time [צפנת פענח].
A deep psychological block also prevented their recognition. While Joseph anticipated their arrival knowing the famine would drive them to Egypt, the brothers assumed he was either dead or permanently lost. It never crossed their minds that the young slave they had sold to nomads had ascended to become the supreme ruler of the Egyptian empire [רמב״ן, קצור בעל הטורים, אור החיים]. This reality was so unfathomable that it suppressed basic human nature, which typically allows the hearts of estranged relatives to resonate and spark memories upon reuniting [אור החיים]. On a spiritual level, the brothers simply could not imagine that a powerful viceroy deeply entrenched in the material wealth and politics of Egypt could possibly be their righteous brother [חומש קה״ת].
Many commentators offer a profound moral reading of this interaction. Joseph's recognition was not merely physical; he recognized their bond of brotherhood. Now that they had fallen into his power, he looked upon them with mercy and viewed them as brothers. Even his harsh words and accusations of espionage were carefully calculated for their ultimate benefit, serving as a means to help them achieve atonement for their past actions [רש״י, רד״ק, אדרת אליהו, הדר זקנים]. In stark contrast, the brothers' failure to recognize him mirrors their behavior years earlier. When Joseph had fallen into their hands, they alienated him, refused to treat him as a brother, and even avoided calling him by his name [שפתי כהן, משכיל לדוד].
Ultimately, Joseph realized with absolute certainty that his brothers had no idea who he was. This clear realization gave him the confidence to move forward with his plan, allowing him to speak harshly and test them without any fear that his disguise would be compromised [העמק דבר, פרדס יוסף, גור אריה].