الكافي 1/4/117/2

2. A number of our people has narrated from Ahmad ibn Muhammad from ibn al-Fadhal from ibn Bukayr from Zurara who has said the following. “I heard Abu Ja‘far عليه السلام say, ‘Ali ibn al-Husayn عليه السلام had a she camel. He had taken this camel twenty two times to Hajj (pilgrimage to Mecca) and had not used the whip against not even once. The Imam عليه السلام has said that the camel came after he passed away and we were not aware but we noticed only when one of the servants or slaves came and said, 'The she camel has went out all the way to the grave of Ali ibn al-Husayn عليه السلام and sat on the grave. She rubs her neck against the grave and moans. I then asked them to quickly get to her before they would know about her or see her. The Imam عليه السلام has said, 'She had never seen the grave before.'”