الكافي- ط الاسلامية, volume 1, page 397

7. Ali ibn Muhammad has narrated from Salih ibn abu Hammad from Muhammad ibn ’Urma from Ahmad ibn al-Nadr from al-Ni‘man ibn Bashir who has said the following. “Once I was a companion of Jabir ibn Yazid al-Ja‘far‘fi on a journey. When reached he went to meet abu Ja‘far (a.s.). He said farewell to him and came out very happy until we arrived in al-’Ukhayraja, the first length of journey from Fayd to Madina. It was a Friday. We said our prayers at noon. When the camel rose to leave I saw a tall man brownish with a letter. He give it to Jabir who kissed it and placed over his eyes. It was from Muhammad ibn Ali to Jabir ibn Yazid. It had a black ink that was still wet. He asked him, “When were you in the presence of my master?” He said, “Just now.” He asked, “Were you in his presence before or after the prayer?” He said, “I was there after the prayer.” He then opened the seal and began to read the letter and his face began to look strained until he read it to the end. He held the letter and I did not see him laughing or happy until we arrived in Kufa. In Kufa I spent my night and in the morning I went to see him out of respect for him and I found him coming out to me with a large ring made of anklebones around his neck riding on a twig of reeds saying. “I see Mansur ibn Jumhur a ruler but no one obeys him” and such other rhymes. He looked at me and I looked at him and he did not say anything to me and did not say anything to him. I began to weep when I saw him. Children and people gathered around us. He came in al-Rahba and would go in circles with the children and people say, “Jabir has gone mad, Jabir has gone insane. By Allah, only a few days had passed that a letter from Hisham ibn ‘Abd al-Malik came to the governor to look for a man called Jabir ibn Yazid al-Ja‘far‘fi. It said, “Kill him and send his head to me.” The governor turned to the people in his court and asked, “Who is this Jabir ibn Yazid al-Ja‘far‘fi?” they replied, “May Allah grand well being to the governor, he was a man of knowledge, excellence, hadith and Hajj but now he has become insane. He is there with the children riding on a twig of reeds plays with them.” He went to see him and found him playing with the children while riding a twig of reeds. He said, “Thanks to Allah for saving me from killing him.” The narrator has said that just within few days Mansur ibn Jumhur entered Kufa and did what Jabir was speaking of before.”

Translation: Muhammad Sarwar·Thaqalayn link·The Arabic above is the original.