Recently, I have been viewing a video about THE FOUR RIGHTFUL COMPANIONS, where the reciter showed hadith from 2 of the "Six Most Authentic Hadith Books" of Sunni school against the fact the most Sunnis know today, rather they know this with other names as taught to them.
1-Narrated Buraidah: that the Messenger of Allah (ﷺ) said: "Indeed Allah has ordered me to love four, and He informed me that He loves them." It was said: "O Messenger of Allah! Name them for us." He said: "'Ali is among them," saying that three times, "And Abu Dharr, Al-Miqdad, and Salman. And He ordered me to love them, and He informed me that He loves them."
[ Jami` at-Tirmidhi » Chapters on Virtues http://sunnah.com/urn/635980]
2- Ibn Buraidah narrated that his father said: "The Messenger of Allah said: 'Allah has commanded me to love four people, and He told me that He also loves them.' He was asked: 'O Messenger of Allah, who are they?' He said: ''Ali is one of them,' and he said that three times, 'and Abu Dharr, Salman and Miqdad.'"
[ Sunan Ibn Majah » The Book of the Sunnah » https://sunnah.com/urn/1251490]
The reciter also mentioned the Ayat from Quran mentioning about this matter, which I couldn't get reference as of yet as he didn't mention the number/chapter. Anyone know such reference in Quran will be appreciated.