Charles Ellicott Commentary Genesis 45:1

"Then Joseph could not refrain himself before all them that stood before him; and he cried, Cause every man to go out from me. And there stood no man with him, while Joseph made himself known unto his brethren." — Genesis 45:1 (ASV)

Joseph could not refrain himself. —The picture Judah had drawn of his father’s love for Benjamin, the thought that by separating them he might have caused his father to die of grief, and the sight of his brothers, and especially of Judah offering to endure a life of slavery so that Benjamin might go free, overpowered Joseph’s feelings.

He then commanded all his attendants to leave the room, so that there would be no restraint on him or his brothers when he revealed to them that he was the brother whom they had so cruelly condemned to slavery years ago.