Imam Al-Bukhari said:

In the section explaining the aayah, "ta‘ruju al-malaa'ikatu wa-r-ruuh 'ilaihi" (70,4) which the ignorant and careless translated as "the angels and the Spirit ascend unto Him," Al-Bukhari said, "ta‘ruj (linguistically speaking) means 'they ascend', and al-ruuh is Gabriel, and other meanings (of al-ruuh) have been said (by scholars)