Charles Ellicott Commentary Genesis 45:4

"And Joseph said unto his brethren, Come near to me, I pray you. And they came near. And he said, I am Joseph your brother, whom ye sold into Egypt." — Genesis 45:4 (ASV)

I am Joseph your brother. —There is much force in the assurance that he was still their brother. For they stood speechless in terrified surprise at finding that the hated dreamer, upon the anguish of whose soul they had looked unmoved, was now the ruler of a mighty empire. But with magnanimous gentleness he bids them neither to grieve nor be angry with themselves; for behind their acts there had been a watchful Providence guiding all things for good.