If it is looked into deeply...
If it is looked into deeply, Abu Dharr's firm stand on the path which had been strengthened by the Holy Prophet (s) reveals his important virtue. Scholars agree on the point that Abu Dharr did not swerve an inch from the path of the Holy Prophet. After the Prophet even a companion like Salman was forced to swear allegiance and was so much beaten in the masjid one day that his neck became swollen. But Abu Dharr was never found silent.
Allamah Subaiti writes: "Abu Dharr was one of those followers of the Holy Prophet (s) who stuck to their path and stood firm on the covenant which they had made with Allah. He obeyed the Holy Prophet faithfully, followed in his footsteps and imitated his conduct. He did not leave Imam Ali (a) even for a moment, followed him to the end and received the benefits of the light of his knowledge.
Allamah Majlisi writes: Ibn Babwayh narrates on reliable authority from Imam Ja'far al-Sadiq (a) that one day Abu Dharr happened to pass by the Prophet (s) while Jibrail was talking to him in privacy in the form of "Dahyah Kalbi". Abu Dharr went back presuming that Dahyah Kalbi was talking to the Prophet in private. After his return Jibrail said to the Prophet "O Muhammad! Abu Dharr came just now and went back without wishing me.
Believe me if he had wished me I would have certainly wished him back. O Muhammad! Abu Dharr has an invocation with him which is well known among the Heavenly people. Look! When I go up to the heavens ask him of that”. He said, "All right". When Jibrail had left, and Abu Dharr came to the Prophet he said, "O Abu Dharr! Why did you not greet us when you came here a little before?" Abu Dharr replied, "When I came Dahyah Kalbi was sitting with you and you were busy in conversation with him.
I thought you were talking about some secret things and did not consider it proper to intrude upon you. Therefore I went back". The Holy Prophet said, "He was not Dahyah Kalbi but Jibrail who had come to me in the form of Dahyah Kalbi. O Abu Dharr! He was telling me that if you had wished him he would have wished you back. He was also telling me that you possess an invocation which is famous among the celestial people". Abu Dharr felt very much ashamed and expressed his regret..
Then the Holy Prophet said, "O Abu Dharr! Just let me know the prayer which you read and which is talked of in the heavens".