Genesis 44:31-45:7
When he sees that the boy is not with us, he will die, and your servants will send the white head of your servant our father down to Sheol in grief. Now your servant has pledged himself for the boy to my father, saying, 'If I do not bring him back to you, I shall stand guilty before my father forever.' Therefore, please let your servant remain as a slave to my lord instead of the boy, and let the boy go back with his brothers. For how can I go back to my father unless the boy is with me? Let me not be witness to the woe that would overtake my father!"
Joseph could no longer control himself before all his attendants, and he cried out, "Have everyone withdraw from me!"
So there was no one else about when Joseph made himself known to his brothers. His sobs were so loud that the Egyptians could hear, and so the news reached Pharaoh's palace.
Joseph said to his brothers, "I am Joseph. Is my father still well?" But his brothers could not answer him, so dumfounded were they on account of him.
Then Joseph said to his brothers, "Come forward to me." And when they came forward, he said, "I am your brother Joseph, he whom you sold into Egypt. Now do not be distressed or reproach Yourselves because you sold me hither; it was to save life that God sent me ahead of you. It is now two years that there has been famine in the land, and there are still five years to come in which there shall be no yield from tilling. God has sent me ahead of you to ensure Your survival on earth, and to save your lives in an extraordinary deliverance.