Hadith 1764
Abu Hurairah and 'Aishah (May Allah be pleased with them) said:
Aisha bint Abu Bakr's storyعن أبي هريرة وعائشة رضي الله عنهما أن النبي صلى الله عليه وسلم نهى عن الوصال. ((متفق عليه)).
The Prophet (ﷺ) prohibited observing continuous voluntary fasts beyond one day. [Al-Bukhari and Muslim].
In plain words
The Prophet forbade joining voluntary fasts together without breaking them, going beyond a single day. It is a mercy that spares the body and favours steady worship.
Reference : Riyad as-Salihin 1764 In-book reference : Book 17, Hadith 254