Dalil

Riyad as-Salihin 1764

Prohibition of Extending Fast beyond one Day

- عن أبي هريرة وعائشة رضي الله عنهما أن النبي صلى الله عليه وسلم نهى عن الوصال. ((متفق عليه)).

Translation

Abu Hurairah and 'Aishah (May Allah be pleased with them) said: The Prophet (PBUH) prohibited observing continuous voluntary fasts beyond one day. [Al-Bukhari and Muslim].

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Ahmad Muhammad ShakirSahih Lighairihigraded on tirmidhi:1082fawazahmed0
Zubair Ali ZaiSoundgraded on tirmidhi:1082fawazahmed0, hadithunlocked, sunnah.com
al-AlbaniSahihgraded on tirmidhi:1082fawazahmed0