The shift from family tension to open hostility begins with a seemingly innocent act: sharing a dream. This moment exposes deep psychological and spiritual divides between Joseph and his brothers. Joseph experienced a genuine prophetic vision pointing to his future greatness, rather than inventing a story to assert dominance over his family [אור החיים, ביאור יש״ר]. God utilizes such experiences to plant ideas in human hearts and set historical events in motion [רש ר הירש].
There are differing views regarding the exact identity of this vision. One approach suggests it was an entirely separate, initial dream omitted from the text because it never came to pass [חזקוני, ריב״א, שד״ל, צאינה וראינה]. Alternatively, this unrecorded dream featured ten candles failing to extinguish a single candle—a sign that his brothers could not harm him—which was ultimately fulfilled when he was thrown into the pit [ברטנורא על התורה]. A contrasting perspective maintains that this was indeed the famous dream of the sheaves. In this view, Joseph initially boasted about a dream of greatness in general terms, only revealing the specific details later after urging his brothers to listen [אור החיים, ביאור יש״ר].
Why Joseph chose to share this vision with brothers who already despised him is a matter of debate. Some attribute it to youthful foolishness [ספורנו] or even a deliberate attempt to provoke and tease them [רד״ק]. However, many commentators view his actions as a sincere pursuit of peace. Joseph hoped that once his brothers realized his elevated status was decreed by God rather than born of their father's favoritism, they would accept the divine will and abandon their hatred [אור החיים, הכתב והקבלה, צאינה וראינה, ביאור יש״ר]. He also wanted to warn them that they would eventually depend on him, hoping they would cease their hostility to avoid his future vengeance [אור החיים]. Furthermore, knowing that a dream's impact is shaped by its interpretation, he approached them hoping they would act like loving brothers and interpret it favorably [אור החיים, מלבי״ם]. From a spiritual standpoint, Joseph recognized the dream as true prophecy. Since concealing a prophetic message is a severe offense against God, he chose to risk his brothers' fury rather than face divine punishment [רא״ש].
The brothers' reaction was immediate and harsh. Their hatred intensified the moment he announced he had a dream, even before he revealed its contents [העמק דבר, ביאור שטיינזלץ]. Because dreams are typically shared only with loved ones, Joseph’s attempt to confide in them as if they were close friends was perceived as hypocrisy and sheer audacity. This infuriated them so much that they initially refused to even listen [העמק דבר, מלבי״ם, רש ר הירש]. Once they finally heard the details, they rejected any notion of a divine message. Believing that a person dreams at night about their daytime obsessions, they accused Joseph of harboring conscious ambitions to dominate them [הטור הארוך, אלשיך]. Some even judged him as a false prophet attempting to deceive their father to secure the primary blessings, concluding that he deserved to die [נחלת יעקב]. Ultimately, their animosity doubled: they hated him both for his desire to rule over them and for the arrogant, boastful manner in which he shared his ambitions [הטור הארוך, אלשיך].