"It is said about Hazrat Umar (ra) that as a Caliph, he made rounds of the city at night to learn about the problems of his people. He helped the poor and needy and aided the grief-stricken. If he came across anyone doing something wrong, he reformed that person. One night, he was on his usual rounds at the time of Tahajjud, he heard two women in a house speak to each other and he pictured that one of them was an old woman while the other was young. The former said to the latter who was her daughter, "Mix some water into the milk to increase the quantity before we sell it." The young woman said, "Mother, the Aamir-ul-Mumineen, Umar (ra), has prohibited every milkseller from doing so. We must not do it." "The aamirulmumineen is not here. He cannot see you. No one can see you in this hour of the night if you put some water into the milk." The young woman replied, "Mother! It may be true that the Aamir-ul-Mumineen does not watch us but what about his Lord. Is He not watching us? We must not do the wrong thing." Hazrat Umar (ra) heard all that they had spoken and in the morning enquired about them. Then he sent a proposal of marriage of his son for the young woman and Abdullah bin Umar (ra) was married to her. His grandson, Umar bin Abdul Aziz (ra) was born from this family and became to be considered the fifth rightly-guided Caliph."
-Mufti Taqi Usmani