This hadith is graded as Hassan Hadith. This tells us the special status of Ali, Abu Dharr, Miqdad and Salman among the companions.
Sayyidina Buraydah (RA) reported that Allah’s Messenger (SAW) said, “Surely, Allah has commanded me to love four and has informed me that He also loves them.” He was requested, “0 Messenger of Allah, name them to us.” He said, “Ali is one of them.” He said this three times. “And, Abu Dharr, Miqdad and Salman. And commanded me to love them and informed me that He also loves them.”