The scrutiny of 'Umar (may Allah be pleased with him) in seeking the chain of narration

Question : Also, among the people of knowledge (may Allah have mercy on him, Blessed and Exalted is He), regarding the integrity of the Companions (may Allah the Exalted be pleased with them), and the acceptance of a single report, what is the ruling on what he did?

Answer : Yes. 'Umar (may Allah be pleased with him), due to his extreme scrutiny, sometimes asked the narrator who his source was, as in this hadith, as in the story of Abu Musa regarding seeking permission to enter, and likewise in the one who narrated that the Messenger (peace and blessings be upon him) gave the grandfather one-sixth. So (may Allah be pleased with him) sometimes he would scrutinize to increase reassurance.