Genesis 37:5

Here, I. Joseph relates the prophetical dreams he had, Gen 37:6, Gen 37:7, Gen 37:9, Gen 37:10. Though he was now very young (about seventeen years old), yet he was pious and devout, and well-inclined, and this fitted him for God's gracious discoveries of himself to him. Joseph had a great deal of trouble before him, and therefore God gave him betimes this prospect of his advancement, to support and comfort him under the long and grievous troubles with which he was to be exercised. Thus Christ had a joy set before him, and so have Christians. Note, God has ways of preparing his people beforehand for the trials which they cannot foresee, but which he has an eye to in the comforts with which he furnishes them. His dreams were, 1. That his brethren's sheaves all bowed to his, intimating upon what occasion they should be brought to do homage to him, namely, in seeking to him for corn; their empty sheaves should bow to his full one. 2. That the sun, and moon, and eleven stars, did obeisance to him, Gen 37:9. Joseph was more of a prophet than a politician, else he would have kept this to himself, when he could not but know that his brethren did already hate him and that this would but the more exasperate them. But, if he told it in his simplicity, yet God directed it for the mortification of his brethren.

— Matthew Henry's Concise Commentary (public domain)

THE DREAMS OF JOSEPH. (Gen. 37:5-36) Joseph dreamed a dream--Dreams in ancient times were much attended to, and hence the dream of Joseph, though but a mere boy, engaged the serious consideration of his family. But this dream was evidently symbolical. The meaning was easily discerned, and, from its being repeated under different emblems, the fulfilment was considered certain (compare Gen 41:32), whence it was that "his brethren envied him, but his father observed the saying" [Gen 37:11].

— Jamieson-Fausset-Brown Commentary (public domain)