'When Husayn (AS) was born, Allah, most High, revealed to Gabriel (AS) that a boy had been born to Muhammad, and to descend to him, to congratulate him, and to tell him that indeed 'Ali's position with respect to you is as that of Aaron to Moses. So name him with the name of Aaron's son. So Gabriel (AS) descended, congratulated him on behalf of Allah, and then said, 'Verily Allah commands you to name him with the name of Aaron's son'. He [the Prophet] asked, 'And what was his name?' He replied, 'Shubayr.' He said, 'But my language is Arabic.' He said, 'So name him Husayn [i.e. its Arabic equivalent].'