Mohammad bin Idrees in his book ‘Aakhir al-Sarair’ quotes from the book  ‘Masail al-Rijaal’, from Aba al-Hasan Ali bin Mohammad (as);

“Ali bin Isa wrote to Imam Ali bin Mohammd (as) [9th Imam] asking Him about the Nasibi*, Is it needed to evaluate him upon more than Him bringing forward Jibt and Taghoot (Abu Bakr and Umar) (putting them ahead of the Imam’s) and believing in their Imamat ? The reply came, “The one who is upon that then he is a Nasibi”