In the Sahihain it is narrated that Ayesha R.A said when a relative of hers would die the women would gather on that occasion and would depart except for her family members and close associates. She would oder that milk soup be prepared. Than “sareed” would be made and she would pour milk soup on it. Ayesha R.A would then ask them to eat saying “I heard the Messenger of Allah P.B.U.H saying:
“Milk soup brings relief to the heart of the sick and takes away some of the anguish”’
Milk soup, means the kind of soup that is similar to milk in consistency.
This is a beneficial food suitable for the sick, especially when well cooked until acquiring a soft consistency. Barley soup os mad of whole barley grains, while the milk like soup is made of ground barley flour with its bran.
It is necessary to observe the habits and customs of a certain sick person so that milk soup benefits them with favourable cure and nourishment. The people in Madinah accustomed to eating barley soup grounds not whole, thus making it more nutritious and beneficial for them. The doctors in cities recommend the use of whole barley grains, because the soup in this case is lighter and easier for the ailing person to digest. The people who live in cities are used to comfort and easy life and that is why ground barley grain is heavy on their stomachs.
Whole grain barley soup digests quickly, provides good nutrition, and cleans the stomach, especially when taken while it is still hot. In this case it's cleansing and digestive qualities are stronger and the soup will also develop its instinctive heat quicker and will soften the outer layers of the stomach.
The Prophet’s statement that the milk like soup take away some of the sadness refers to the effect of sadness on the mood and in weakening the instinctive well being, which in turn affects the soul and heart. Milk like soup brings strength to one’s inner energy and thus the body will be able to rid itself of the sadness and the grief that took it over.