Bahá'u'lláh departed from Tihran for Iraq on 12 January 1853. Among those
who accompanied Him in His exile was His eldest son, nine-year-old Abbas, who
later assumed the title of Abdu'l-Bahá (Servant of Baha). He had such spiritual
insight that, as a young boy, He intuitively recognized the station of His
Father. So highly did Bahá'u'lláh esteem Him that in Baghdad He used to address
Him, while still in His teens, as the Master -- a designation which Bahá'u'lláh
had also used for His own father while in Tihran.
- Adib Taherzadeh (The Revelation of Baha'u'llah vol. 1)
