The rabbis particularly praise the brotherly sentiment between Aaron and Moses. When Moses was appointed ruler and Aaron high priest, neither betrayed any jealousy; instead they rejoiced in each other's greatness. When Moses at first declined to go to Pharaoh, saying: "O my Lord, send, I pray, by the hand of him whom you will send" (Exodus 4:13), he was unwilling to deprive Aaron of the high position the latter had held for so many years; but the Lord reassured him, saying: "Behold, when he sees you, he will be glad in his heart" (). Indeed, Aaron was to find his reward, says Shimon bar Yochai; for that heart which had leaped with joy over his younger brother's rise to glory greater than his was decorated with the Urim and Thummim, which were to "be upon Aaron's heart when he goeth in before the Lord". Moses and Aaron met in gladness of heart, kissing each other as true brothers, and of them it is written: "Behold how good and how pleasant is for brethren to dwell together in unity!" (Psalm 133:1). Of them it is said: "Mercy and truth are met together; righteousness and peace have kissed other"; for Moses stood for righteousness (Deuteronomy 33:21) and Aaron for peace (). Again, mercy was personified in Aaron, according to Deuteronomy 33:8, and truth in Moses, according to Numbers 12:7.