Sunan an-Nasa'i 2336
سنن النسائي#2336SahihHamzah bin 'Abdullah bin 'Umar narrated that his father said:"Hafsah, the wife of the Prophet said: 'There is no fast for the one who does not intend (to fast) before dawn
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih Muquf
Al-AlbaniSahih Muquf
Zubair Ali ZaiIsnaad Sahih
In-book reference: 22:247