וראך ושמח בלבו. לפי שהיה משה אומר מה אני בא בתחומו של אהרן מתנבא שנאמר הנגלה נגליתי וגו' אמר לו ית' למה אתה מזכיר אהרן אינו מיצר אלא שמח הה"ד ויאמר ה' אל אהרן לך לקראת משה כדי שידע שאתה שמח: וראך ושמח בלבו, “as son as he sees you he will rejoice in his heart.” The reason why G–d had to tell him this was that Moses had not wanted to usurp the status of his older brother as he feared that this might lead to his becoming jealous of him. (Sh’mot Rabbah 2,27. G–d told him that he had no reason to worry about this, and that He had already commanded Aaron to be on his way to be reunited with his brother whom he had not seen or heard from for many decades. (Exodus 4,27) Moreover, G–d also told him that all the people in Egypt who at one time had sought to have him executed had already died so that he did not have anything to fear for the safety of his person.