Bahá’u’lláh’s sent his son Mírzá Muhammad-`Alí to Bombay

In accordance with Bahá’u’lláh’s instructions, in 1308 A.H. [1891], Mírzá Muhammad-`Alí [Bahá’u’lláh’s son] went to Bombay to publish some of the Holy Tablets. As the Blessed Beauty instructed, he purchased a gravestone for the resting place of the wife of the Báb.

(Memories of the Báb, Bahá’u’lláh and `Abdu’l-Bahá by Mírzá Habíbu’lláh Afnán, p 18)

https://bahai-library.com/pdf/r/rabbani_habibullah_afnan_memories.pdf