The words Umm Salamah could not bring herself to mean
She said them and then argued with herself about them.
اللَّهُمَّ أْجُرْنِي فِي مُصِيبَتِي وَأَعْقِبْنِي خَيْرًا مِنْهَا
Allāhumma ʾjurnī fī muṣībatī wa aʿqibnī khayran minhā
“O Allah, reward me in my affliction and give me something better than it after it.”
Where this comes from
Whoever is struck by a misfortune and says what Allah commanded, innā lillāhi wa innā ilayhi rājiʿūn, and then this, Allah will do it for him. She said it when Abu Salamah died, and then said to herself: and who is better than Abu Salamah. She reports the rest herself.
The full narration
Yahya related to me from Malik from Rabia ibn Abi Abd ar-Rahman from Umm Salama, the wife of the Prophet may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, said, "If a misfortune befalls some one and he says, as Allah has ordered, 'We belong to Allah and to Him we are returning. O Allah, reward me in my misfortune and give me better than it afterwards,' Allah will do that for him" (Inna lillahi wa inna ilayhi rajiun. Allahumma' jurniy fi musiybatiy, wa a qibhiy khayran minha, illa faala 'llahu dhalika bihi.). Umm Salama said, "When Abu Salama died I said that, and then I said, 'Who is better than Abu Salama?' " And then Allah left her the Messenger of Allah, may Allah bless him and grant him peace, and he married her
Source
Muwaṭṭa' Mālik · 561
- Salim al-Hilali: Sahih