Commentary for Genesis 37:7

מאלמים אלמים — Understand it as the Targum renders it: were binding bundles i.e. sheaves. Similar is (Psalms 126:6) “bearing (אלומותיו) its sheaves”. Similarly in Mishnaic Hebrew we have (Bava Metzia 22b) “and he takes (האלומות) the sheaves and makes public proclamation”.

MY 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.

והנה אנחנו מאלמים אלומים, "Here we were tying sheaves, etc." Why is the word והנה repeated three times in this verse? You should appreciate that if a dream is to be perceived as a prophetic vision, it is essential that it be as clear and distinct as bright daylight. The person dreaming it should have the feeling that he actually experiences what he sees in the dream as if it were reality. When these conditions are met, he may consider the dream as a prophetic revelation. Dreams that young people dream are often blurred or contain unlikely and exaggerated occurrences. When Joseph told his dream to the brothers he repeated the word והנה three times to demonstrate that each part of the dream had been crystal clear, and that at the time he had thought that the events shown him in the dream were actually happening. This is why he thought that the dream foretold the future in some way.