The report transmitted by Imām Aḥmad and judged authentic by al-Tirmidhī ⦗1⦘, and likewise narrated by al-Bayhaqī and al-Bukhārī in al-Tārīkh, comes through Abū Ẓubyān Ḥuṣayn ibn al-Mundhir from Ibn ʿAbbās, who said:
“A Bedouin came to the Messenger of Allah ﷺ and asked, ‘How shall I know that you are truly the Messenger of Allah?’ He replied, ‘If I call this cluster of dates from that palm-tree, will you bear witness that I am the Messenger of Allah?’ The man said, ‘Yes.’ So he summoned the cluster, and it began to descend from the palm until it dropped to the ground, then hopped along until it stood before the Messenger of Allah ﷺ. He said to it, ‘Return,’ whereupon it went back and resumed its place. The Bedouin declared, ‘I testify that you are the Messenger of Allah,’ and he believed in him.” ⦗2⦘
This is al-Bayhaqī’s wording, which plainly shows that the one who gave testimony was the Bedouin himself, a man of Banū ʿĀmir. Yet al-Bayhaqī also records, through al-Aʿmash from Sālim ibn Abī al-Jaʿd, from Ibn ʿAbbās (may Allah be pleased with him):
“A messenger came to the Messenger of Allah ﷺ and said, ‘What is it that your Companions are claiming?’ Around the Messenger of Allah ﷺ were date clusters and trees. He said, ‘Would you like me to show you a sign?’ ‘Yes,’ the man replied. He then called one of the branches, and it came scraping the ground until it stopped before him, bowing in prostration and then lifting its head. He ordered it to return, and it went back. The man of Banū ʿĀmir departed saying, ‘O Banū ʿĀmir ibn Ṣaʿṣaʿah, by Allah I will never deny anything he says again.’” ⦗3⦘
We earlier cited—solely from al-Ḥākim in his Mustadrak—another report, from Ibn ʿUmar: the Messenger of Allah ﷺ invited a man to embrace Islam. The man asked, “Have you a witness to what you say?” He replied, “This tree.” He then summoned the tree, which stood on the edge of the valley; it came scraping the earth until it stood before him. He asked it to testify three times, and it bore witness that he was as he claimed. It then returned to its place, while the Bedouin went back to his people saying, “If they follow me I shall bring them all to you; if not, I will return and stay with you.” ⦗4⦘
As for the moaning of the palm-trunk against which the Prophet ﷺ used to deliver the sermon: when a pulpit was built for him and he ascended it to preach, the trunk groaned toward him like a she-camel longing for her calf—a sound heard by the assembled multitude on a Friday. It continued to wail and lament until the Prophet ﷺ came down, embraced it, and calmed it. He then offered it the choice of becoming once more a fresh, green branch or being planted in Paradise for the friends of Allah to eat from; it chose to be planted in Paradise and fell silent. This ḥadīth ⦗5⦘ is famous and well known. A large number of Companions transmitted it in uninterrupted succession, in the presence of countless onlookers. The assertion that the incident is mutawātir is indeed correct: groups of Companions reported it, from whom numerous Successors received it, followed by others after them, in a way that precludes any collusion.