1764/1 - Abu Hurayrah and ‘Ā’ishah (may Allah be pleased with them) reported that the Prophet (may Allah’s peace and blessings be upon him) forbade uninterrupted fast. [Narrated by Al-Bukhāri and Muslim]
1765/2 - Ibn ‘Umar (may Allah be pleased with him and his father) reported: “The Messenger of Allah (may Allah’s peace and blessings be upon him) forbade uninterrupted fast. They said: ‘But you observe uninterrupted fast.’ He said: ‘I am not like you. I am given food and drink (by Allah).’” [Narrated by Al-Bukhāri - this is his wording - and Muslim]
1) It is prohibited to fast uninterruptedly lest one should get bored with uninterrupted worship.
2) They point out Allah’s vast mercy and kindness towards His servants. Indeed, He is more merciful to them than their own selves.