Musnad Abu Ya'la al-Mawsili 2:76

Ibrahim ibn al-Hajjaj narrated to us, Hammad narrated to us, from Ali ibn Zayd, from Abu Rafi’, from Umar ibn al-Khattab, that the Messenger of Allah (ﷺ) was at al-Hajun, and he was sorrowful and sad. He said, "O Allah, show me a sign today, and I will not care who among my people denies me after it." So he called a tree from the direction of the mountain pass of the people of Medina. He called it, and it came, splitting the earth until it reached him, and it greeted him. Then he commanded it, and it went away. He said, "I do not care who among my people denies me after it."