Ramban on Genesis 37:7/רמב"ן על בראשית ל״ז:ז׳

1MY SHEAF AROSE, AND ALSO PLACED ITSELF UPRIGHT, AND, BEHOLD, YOUR SHEAVES SURROUNDED. The purport of the dream concerning the sheaves is that Joseph was shown that through the sheaves and the produce they will prostrate themselves to him. The matter of “surrounding” — [your sheaves surrounded] — is to indicate that they will surround him as they do a king arrayed for battle, around whom his subjects encamp.