Abu Dharr reported God's messenger as saying, "The sky has not covered and the earth has not carried anyone who speaks more truthfully or is more faithful in keeping his word than Abu Dharr. He resembles Jesus, son of Mary," i.e., in asceticism. Tirmidhi transmitted it.
Hadith Referenceمشكوة المصابيح / كتاب المناقب / 6239
Hadith Gradingالألبانی:حسن | زبیر علی زئی:إسناده حسن
Hadith Takhrij´تحقيق و تخريج: محدث العصر حافظ زبير على زئي رحمه الله` «إسناده حسن، رواه الترمذي (3802)»