It is narrated from Ali ibn Suwayd, who said: I said to Abu al-Hasan al-Madhi عليه السلام (Imam Musa ibn Jafar Al-Kadhim عليه السلام): "These people call me to testify against my brothers." Imam عليه السلام said: 'Yes, establish the testimony for them, even if you fear harm for your brother.'"
