Sunan an-Nasa'i 2342
سنن النسائي#2342SahihIt was narrated that Ibn 'Umar said:"If a man does not intend to fast from the night before, he should not fast
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: 22:253