69 – The reason is that it leads to a form of fraud the buyer cannot detect; even if the seller tells him the milk has been adulterated, the extent of that adulteration remains unknown. For this very reason the scholars have likewise prohibited such dealings¹.

70 – One night, while ʿUmar was patrolling the city², he heard a woman say to another, “Get up and mix the milk.”
The second replied, “But the Commander of the Believers has forbidden that!”
The first retorted, “And how would the Commander of the Believers ever know?”
The other replied, “By Allah, we will not obey him openly only to disobey him in secret.”
ʿUmar thereupon marked the door³, and when morning came he inquired about the people of that house. It turned out to be the household of this very ʿĀṣim. The Commander of the Believers—who was later martyred—found that the obedient young woman was his daughter, so he asked for her hand and married her⁴.

71 – Another report states that he instead married her to his son, this same ʿĀṣim. In fact, ʿUmar had earlier married another daughter of ʿĀṣim, who bore him his son ʿĀṣim; and the veracious ʿUmar ibn ʿAbd al-ʿAzīz was from the descendants of ʿĀṣim.