Shaikh Haafidh Zubair Ali Zai rahimahullah wrote in his book Fadaail-us-Sahaabah:

“Imam Abu Ja’far Muhammad ibn Ali ibn Hussain al-Baaqir rahimahullah said:

مَنْ جَهِلَ فَضْلَ أَبِي بَكْرٍ وَعُمَرَ ، فَقَدْ جَهِلَ السُّنَّةَ

“Whoever is ignorant of the virtue of Abu Bakr and Umar radiallahu anhumma, then he is ignorant of the Sunnah”

[Reported by Imam al-Ajurri in ash-Shariah pg. 851 no. 1803 and its chain is Hasan]

Translated by

Faisal ibn Abdul Qaadir ibn Hassan
Abu Sulaymaan