The Marriage From Heaven
After the demise of Hazrat Ruqayyah (Radhiyallahu anha), Rasulullah (Sallallahu alaihi wasallam) saw that Hazrat Uthmaan (Radhiyallahu anhu) was sad and grieved. Rasulullah (Sallallahu alaihi wasallam) asked him, “Why are you so sad?” He replied, “O Rasulullah! Has anyone been afflicted with a greater calamity than me? The daughter of the Rasool of Allah who was married to me has passed away. This has shattered me, and now the relationship which I had with you as a son-in-law no longer remains.”
While this talk was taking place, Rasulullah (Sallallahu alaihi wasallam) said: “O Uthmaan! Jibreel has come and he has given me an instruction from Allah that you should marry the sister of your deceased wife, Umme Kulthum for the same mahr which was given to her; and you should live with her with the same happiness that you had lived with her sister.”
Thereafter, Rasulullah (Sallallahu alaihi wasallam) performed the nikaah of Hazrat Umme Kulthum to Hazrat Uthmaan (Radhiyallahu Ta’ala Anhuma).
The nikaah took place during Rabiul Awwal 3 Hijri, and in Jumaadal Ukhra 3 Hijri Hazrat Umme Kulthum (Radhiyallahu anha) went to her new home. She remained in the nikaah of Hazrat Uthmaan (Radhiyallahu anhu) for six years before she departed for the Eternal Kingdom. She did not have any children.
(Rasulullah Sallallahu Alaihi Wasallam Kee Saahbzaadiya)