Sunan al-Nasa’i 17081

“There is no fast for the one who does not intend to fast before dawn.” Malik bin Anas narrated it in Mursla from.

Sunan al-Nasa’i 17073

“Whoever does not have the intention of fasting before dawn, then there is no fast for him.” (Daif)

Sunan al-Nasa’i 17075

“Whoever does not have the intention of fasting from the night before, then there is no fast for him.” (Daif)