Al-Husayn b. Ahmad al-Bayhaqi narrated to us. He said: Muhammad b. Yahya al-Suli informed us. He said: Harun b. `Abdullah al-Mahlabi narrated to me. He said: De`bal b. `Ali al-Khuza`i narrated to us. He said:

When I was staying in Qum, the news of the death of `Ali b. Musa al-Rida came to me. So, I said this visionary poem: I see that [Bani] Umayya are excused if they kill, But I see no excuse for Bani al-`Abbas. Sons of Harb, Marwan, and their kin, Bani Mu`it are the masters of hatred and grudges, The firsts of them were killed upon Islam, Once they came to power, they were able to disbelieve [again]. Head to Tus, to the grave of the pure, If you were there, you would find two graves in Tus, The best of all the people, and the grave of the worst of them. This is a lesson that impurity cannot benefit from nearness to purity, Nor can the pure be harmed by nearness to impurity. No way! Every soul will reap what its hands sow, So, harvest what you wish, or sow a seed.