It is narrated from Sayyiduna Abu Hurayrah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Never has this green vault of the heavens shaded, nor this dusty earth carried, anyone more truthful in speech than Abu Dharr (may Allah be pleased with him). And whoever would be delighted to behold humility and lowliness like that of Isa bin Maryam (peace be upon him), let him look at Abu Dharr (may Allah be pleased with him)."
Imam Abu Bakr bin Abi Shaybah and Ahmad bin Mani' recorded it; in its chain Abu Umayyah bin Ya'la is a da'if (weak) narrator; however, the first part of this hadith is sahih (authentic) on the strength of other reliable supporting reports and corroborating chains, while the part with the comparison to Isa (peace be upon him) is also established in its basis because it is transmitted through various routes.
Hadith Referenceالمطالب العالية بزوائد المسانيد الثمانية / كتاب المناقب / 4075
Hadith Gradingمحدثین:إسناده ضعيف جدًا
Hadith Takhrij«حکم الحدیث المطالب العالیہ محققاً تنسیق د. سعد بن ناصر بن عبد العزيز الشَّثري- مکتبہ شاملہ :إسناده ضعيف جدًا » «أخرجه مسند أحمد برقم: 21217، وأخرجه مصنف ابن أبي شيبة برقم: 2، وأخرجه مجمع الزوائد ومنبع الفوائد برقم: 15816، وأخرجه إتحاف الخيرة المهرة بزوائد المسانيد العشرة برقم: 6925»