Musnad Ahmad 1098:8

Ishaq ibn Yusuf narrated to us, Ibn 'Awn narrated to us, from Muhammad, from Qays ibn 'Abbad, who said: I was in the mosque when a man came in, upon whose face was a trace of humility. He entered and prayed two rak'ahs, making them brief. The people said, "This is a man from the people of Paradise." When he left, I followed him until he entered his house. I entered with him and spoke to him. When he became comfortable with me, I said to him, "When you entered the mosque, the people said such and such." He said, "Subhan Allah! It is not fitting for anyone to say what he does not know. I will tell you why: I saw a vision during the time of the Messenger of Allah (peace and blessings of Allah be upon him), and I narrated it to him. I saw as if I were in a green meadow." Ibn 'Awn said: He mentioned its greenness and its vastness. In its center was an iron pillar, its base in the earth and its top in the sky, and at its top was a handle. It was said to me, "Climb it." I said, "I cannot." Then a servant came to me—Ibn 'Awn said: He meant a young attendant—and he lifted my garment from behind me and said, "Climb it." So I climbed until I took hold of the handle. He said, "Hold fast to the handle." I awoke, and it was still in my hand. He said: So I came to the Prophet (peace and blessings of Allah be upon him) and narrated it to him. He said, "As for the meadow, it is the meadow of Islam. As for the pillar, it is the pillar of Islam. And as for the handle, it is the firmest handle (al-'urwah al-wuthqa). You are upon Islam until you die." He said: And he is 'Abdullah ibn Salam.