Sunan an-Nasa'i 3508
سنن النسائي#3508SahihIt was narrated that Abu As-Sanabil said:"Subai'ah gave birth twenty-three or twenty-five days after her husband died, and when her Nifas ended she expressed her wish to remarry and was criticized for that. Mention of that was made to the Messenger of Allah and he said: 'There is nothing to stop her; her term has ended
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiHasan
In-book reference: 27:120