The episode of Badasht in the words of Abdul Baha

When at dawn Ḥájí Mullá Taqí (Shi'ih cleric and father-in-law of Tahirih) came to the mosque, that individual (a Shaykhi from Shiraz) stabbed him in the back and in the mouth with a spear-tipped cane. Ḥájí Mullá Taqí fell to the ground and his assailant fled. When the people arrived, they saw the cleric lying dead….

… As a result, Ṭáhirih (also a Shaykhi, whose hate for Ḥájí Mullá Taqí was well known) met with the greatest hardship. No one would associate with her, and all her relatives—even her husband and two sons—showed the greatest enmity and would oppress and revile her. Bahá’u’lláh dispatched Áqá Hádíy-i-Qazvíní from Ṭihrán and, by an elaborate stratagem, arranged for Ṭáhirih to be rescued from Qazvín and brought directly to the private quarters of His house.

Later Bahá’u’lláh sent her with a number of believers towards Badasht. Their first stop was a beautiful and verdant garden. Ṭáhirih and the friends arrived there and were later joined by Bahá’u’lláh, Who rested the night there. In the morning He sent Ṭáhirih and the friends with ample provisions to Badasht. After a few days, Bahá’u’lláh Himself went there. When He reached Badasht, Quddús had returned from Khurásán and he, too, came to Badasht, but he remained concealed.

In Badasht there was a field with a stream running through it and gardens to either side. Quddús remained concealed in one of the gardens, and Ṭáhirih resided in the other. A tent had been pitched for Bahá’u’lláh on that field, and the other believers were also housed in tents erected on the same field. In the evenings Bahá’u’lláh, Quddús, and Ṭáhirih would meet. Bahá’u’lláh made a solemn agreement with them that the truth of the Cause would be proclaimed at Badasht, but no specific day was designated.

Then, by chance, Bahá’u’lláh fell ill. As soon as he was informed, Quddús emerged from his concealment and entered Bahá’u’lláh’s tent. Ṭáhirih sent a message saying: “Either bring Bahá’u’lláh to the garden where I reside or I will come myself.” Quddús said: “Bahá’u’lláh is unwell and cannot come”, which was a signal. Ṭáhirih, seizing upon the opportunity, arose and, unveiled, came forth from the garden. She proceeded towards the tent of Bahá’u’lláh crying out and proclaiming: “I am the Trumpet-blast; I am the Bugle-call!”—which are two of the signs of the Day of Resurrection mentioned in the Qur’án. Calling out in this fashion, she entered the tent of Bahá’u’lláh. No sooner had she entered than Bahá’u’lláh instructed the believers to recite the Súrih of the Event from the Qur’án, a Súrih that describes the upheaval of the Day of Resurrection.

www.bahai.org/library/authoritative-texts/abdul-baha/twelve-table-talks-abdul-baha/twelve-table-talks-abdul-baha.xhtml