The Prophet صلى الله عليه و سلم said "Umm Waraqah! Dwell in your house, Allah will give you a death as a martyr"

The Ansar of al-Madina were standing on the outskirts of their city, looking with impatient eyes towards the road approaching from Makkah. Men, women, girls, and boys, the young and the old were waiting for the arrival of their beloved Prophet who was migrating from his city to theirs at their invitation and the command of Allah. Suddenly someone shouted, 'Here they come!" and all the young girls and women burst into a song of praise of Allah and a welcome to His Messenger صلى الله عليه و سلم. Among these Ansari women was Umm Waraqah bint Abdullah. She was a learned, scholarly, pious and modest lady, who was well known among the women Companions as one who spent her nights and days in prayer and meditation. She used to recite the Quran beautifully; it was second nature for her to spend alot of time meditating on the meaning of its verses.
The Prophet صلى الله عليه و سلم valued her highly and he told her to lead the family in congergational prayers. The courtyard of the house was converted into a mosque; with the permission of the Prophet صلى الله عليه و سلم they had a Mu'ththin to give the call to prayers. Abdur-Rahman bin Khallad says that he saw the Mu'ththin, who was a very aged man. Thus Umm Warqah bint Abdullah was appointed to be an Imaam and lead the prayers for the ladies.
Besides her thirst for knowledge of the Quran, shari'ah (islamic legislation) and Ahadith, Umm Waraqah had a burning desire to die a martyr in the cause of Islam. When it was announced that the army should prepare to leave for battle of Badr, Umm Waraqah went to the Prophet صلى الله عليه و سلم and volunteered her services to tend to the wounded in the battlefield. She told him it was her earnest desire to die in the cause of Islam. The Prophet صلى الله عليه و سلم could see her enthusiasm and ardour, but he told her to stay at home and she would attain martyrdom there. She went back happily because it was her duty to yield to the command of the Messenger of Allah
Allah سبحانه و تعالى reveled to his beloved Messenger صلى الله عليه و سلم that Umm Waraqah would die the death of a martyr in her own home. Nobody could understand how this would take place with her sitting in her house, but they were sure it would definitely happen, as this news had been give to them by their truthful Prophet صلى الله عليه و سلم
Umm Waraqah herself was waiting every moment to see how this auspicious event, which would be the fulfillment of her greatest dream, take place. She waited patiently, for it would give her eternal life and a place in Paradise. When would it take place? How exactly would it take place? What shape would it take? How would it be possible to become a martyr sitting in the house? Lost in these thoughts she passed her nights and days. The Prophet صلى الله عليه و سلم passed. Abu Bakr Siddique succeeded and also passed away; Umar Farooq became Caliph
Umm Waraqah had two slaves working for her, a girl and a man. She told them that after her death they would be free. One day they got together and decided that they were tired of waiting for this old lady to die. They planned that they would kill her while she lay asleep and escape freedom. They were so tempted by the thought of freedom that they forgot to consider their future as well as life in the hereafter. In the dead of the night as Umm Waraqah lay in a deep sleep, they killed her, covered her body with a sheet and crept away from the house silently.
As day broke and the sun came up the neighbors missed the sound of the beautiful recitation of the Quran by Umm Waraqah which use to fill the air early in the dawn. When they entered the house they were shocked to see her lying in the sleep of death. Then they saw that both the slaves -man and girl- were missing. They realized that they must be the criminals, Umar bin Khattab ordered that people should be sent out to search for them. Finally when they were found hiding. When they were brought before the Caliph in the court, they admitted their guilt and were put to death.
Thus the Prophet صلى الله عليه و سلم was proved right, That Umm Waraqah would die a martyr's death in her own home, and attain Paradise.
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taken from the book Great Women of Islam by Mahmood Ahmed Ghandanfar