Of the two brothers who accompanied Him on that journey the first was Mírzá Músá, commonly called Áqáy-i-Kalím, His staunch and valued supporter, the ablest and most distinguished among His brothers and sisters, and one of the “only two persons who,” according to Bahá’u’lláh’s testimony, “were adequately informed of the origins” of His Faith. The other was Mírzá Muhammad-Qulí, a half-brother, who, in spite of the defection of some of his relatives, remained to the end loyal to the Cause he had espoused.
- Shoghi Effendi (‘God Passes By’, chapter 7)