Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) narrates that a Bedouin came to the Prophet (peace and blessings be upon him) and said: "By what can I know that you are the Messenger of Allah?" He (peace and blessings be upon him) said: "Tell me, if I call this cluster from this date-palm, will you bear witness that I am the Messenger of Allah?" He said: "Yes." So he (peace and blessings be upon him) called the cluster, and it began to come down from the tree until it fell to the ground; then it came hopping and bounding until it reached the Prophet (peace and blessings be upon him). He (peace and blessings be upon him) said to it: "Go back." So it went back and returned to its place. Then the Bedouin said: "I bear witness that there is no god but Allah and that you are indeed the Messenger of Allah."
Imam al-Tabarani (may Allah have mercy on him) said: "No one narrated this hadith from Simak except Sharik."
Hadith Referenceالمعجم الأوسط / باب الميم / 5068
Hadith Takhrij«أخرجه ابن حبان فى «صحيحه» برقم: 6523، والضياء المقدسي فى «الأحاديث المختارة» برقم: 527، 548، 43، والحاكم فى «المستدرك» برقم: 4260، والترمذي فى «جامعه» برقم: 3628، والدارمي فى «مسنده» برقم: 24، وأحمد فى «مسنده» برقم: 1979، وأبو يعلى فى «مسنده» برقم: 2350، والطبراني فى «الكبير» برقم: 12595، 12622»