Hadhrat Abu Saalih Ghifaari narrates that there was an extremely old blind lady living on the outskirts of Madinah whom Hadhrat Umar (r.a.) used to regularly visit at night. He would go there to fetch water for her (from the well) and do other chores for her. However, whenever he got to her, he would find that someone else had beat him there and had already seen to her needs. He went to her many times only to find that he was not the first to get there. (One day) he sat in wait for the person (who always beat him) and found that the person was Hadhrat Abu Bakr (r.a.).
Hadhrat Abu Bakr (r.a.) would tend to the old lady even though he was the Khalifah. Hadhrat Umar (r.a.) exclaimed, "By my life! It could only be you!"
Khateeb. as quoted in Kanzul Ummaal (Vol.4 Pg.347).
Hadhrat Awzaa'ee reports that Hadhrat Talha (r.a.) once spotted Hadhrat Umar (r.a.) coming out (of his house) late at night. Hadhrat Umar (r.a.) entered a house and then another house. The following morning, Hadhrat Talha (r.a.) went to the house, where he found an old woman who was blind and crippled. Hadhrat Talha (r.a.) asked her, 'Why does that man come to you?" She then informed Hadhrat Talha (r.a.) that Hadhrat Umar (r.a.) had been frequently coming to her for many years to see to her needs and remove all the filth from her house. Hadhrat Talha (r.a.) then said to himself, "Shame on you, 0 Talha! Were you searching for faults in Umar?"
Abu Nu'aym in his Hilya (Vol.1 Pg.48).
(From Hayatus Sahabah by Maulana Muhammad Yusuf Khandhlawi)
