What are Abu Dharr's noble qualities in the sight of Allah Almighty, which made him an exemplary figure?

Ibn Sa'd stated in "Al-Tabaqat al-Kubra" that Ali said: "Today, there is no one left who, for the sake of Allah, fears not the blame of any blamer, except for Abu Dharr and myself." It was narrated that Abu Dharr, may Allah be pleased with him, attained this status due to several virtues, including: his extreme eagerness to follow the Prophet, peace and blessings be upon him, his truthfulness in word and deed, his asceticism in worldly matters and his worship, his achievement of a high rank in knowledge, and his intense fear of Allah Almighty.

The Prophet, peace and blessings be upon him, commanded Abu Dharr with certain things, among them: not to fear, for the sake of Allah, the blame of any blamer, not to ask people for anything, and to look at those who are beneath him and not at those who are above him. The Prophet, peace and blessings be upon him, bore witness for him, saying: "The earth has not carried, nor has the sky overshadowed, a man more truthful in speech than Abu Dharr."