Muhammad Baqir al-Majlisi in his “Biharul Anwar” (38/14) narrated:

وروى عن عطية قال: سئل جابر بن عبد الله عن علي قال: ذاك خير البشر ولا يشك فيه إلا منافق. وعن عطاء عن عائشة حيث سئلت عن علي (عليه السلام) فقالت: علي خير البشر لا يشك فيه إلا كافر

Translation:

And it was narrated from Atiyah, that he asked from Jabir ibn Abdullah about Ali, and he said: He is best of creation, and no one except hypocrite would be in doubt regarding that.

And from Ata from Aisha, when she was asked about Ali, she said: Ali is the best of creation, no one except disbeliever would be in doubt about that.

عن ابن عمر قال: قال: رسول الله (صلى الله عليه وآله): من فضل أحدا من أصحابي على علي فقد كفر

Translation:

From ibn Umar, messenger of Allah (sallalahu alaihi wa ali) said: Who ever would put anyone from my companions in the matters of superiority upon Ali, would disbelief.