Sunan an-Nasa'i 3242
سنن النسائي#3242SahihIt was narrated from Abu Hurairah that the Prophet said:"None of you should propose marriage to a woman when someone else has already proposed to her
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu Ghuddah-
Al-AlbaniSahih
Zubair Ali ZaiSahih Muslim
In-book reference: 26:47