One of the greatest female companion of our beloved Prophet Muhammad SAW and her amazing dua.

When we are afflicted with hardships and tests, or simply do not get something we anticipated or hoped for, then the story of Umm Salamah RA brings much comfort to the heart. It also encourages us to build up our own strength and increase our trust in Allah subhanahu wa tala, for surely He is the best of planners and providers.

There was the battle of Badr, in which Abu Salamah fought. The Muslims returned victorious and strengthened. Then there was the battle of Uhud, in which the Muslims were sorely tested. Abu Salamah came out of this wounded very badly. He appeared at first to respond well to treatment, but his wounds never healed completely and he remained bedridden.

Once while Umm Salamah was nursing him, he said to her: “I heard the Messenger of God saying. Whenever a calamity afflicts anyone he should say, “Surely from Allah we are and to Him we shall certainly return,” (inna lillahi wa inna ilayhi rajioon). And he would pray, “O Lord, give me in return something good from it which only You, Exalted and Mighty, can give.” 
Abu Salamah remained sick in bed for several days. One morning the Prophet came to see him. The visit was longer than usual. While the Prophet was still at his bed-side, Abu Salamah passed away. With his blessed hands, the Prophet closed the eyes of his dead companion. He then raised these hands to the heavens and prayed: “O Lord, grant forgiveness to Abu Salamah. Elevate him among those who are near to You. Take charge of his family at all times. Forgive us and him, O Lord of the Worlds. Widen his grave and make it light for him.” Umm Salamah remembered the prayer her husband had quoted on his deathbed from the Prophet and began repeating it, “O Lord, with you I leave this my plight for consideration.” But she could not bring herself to continue “O Lord give me something good from it”, because she kept asking herself, “Who could be better than Abu Salamah?” But it did not take long before she completed the supplication.

The Muslims were greatly saddened by the plight of Umm Salamah. She became known as “Ayyin al-Arab”–the one who had lost her husband. She had no one in Madinah of her own except her small children, like a hen without feathers.

Both the Muhajirun and Ansar felt they had a duty to Umm Salamah. When she had completed the Iddah (three months and ten days), Abu Bakr proposed marriage to her, but she refused. Then Umar asked to marry her, but she also declined the proposal. The Prophet then approached her and she replied:
“O Messenger of Allah, I have three characteristics. I am a woman who is extremely jealous and I am afraid that you will see in me something that will anger you and cause Allah to punish me. I am a woman who is already advanced in age and I am a woman wh o has a young family.”

The Prophet replied:
“Regarding the jealousy you mentioned, I pray to Allah the Almighty to let it go away from you. Regarding the question of age you have mentioned. I am afflicted with the same problem as you. Regarding the dependent family you have mentioned, your family is my family.” They were married and so it was that Allah answered the prayer of Umm Salamah and gave her better than Abu Salamah. From that day on Hind al Makhzumiyah was no longer the mother of Salamah alone but became the mother of all believers, Umm al-Mu’mineen

This is the dua that Umm Salamah RA made as taught to her by Abu Salamah RA as taught to him by Prophet Muhammad (SalAllahu Alayhi Wa Sallam).
Which resulted in Allah giving Umm Salamah RA the Prophet Muhammad (SalAllahu Alayhi Wa Sallam) as a husband, when Abu Salamah RA passed away.

إِنَّا لِلَّهِ وَإِنَّا إِلَيْهِ رَاجِعُوْنَ، اَللَّهُمَّ أْجُرْنِيْ فِيْ مُصِيْبَتِيْ وَأَخْلِفْ لِيْ خَيْرًا مِنْهَا.
Innaa lillaahi wa 'innaa 'ilayhi raaji'oon, Allaahumma'-jurni fee museebatee wa 'akhliflee khayran minhaa

‘To Allaah we belong and unto Him is our return. O Allaah, recompense me for my affliction and replace it for me with something better.’
[ Muslim 2/632 ]