It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Protect yourselves from fasting continuously with only one pre-dawn meal. The Noble Prophet (peace and blessings be upon him) said this three times. The companions (may Allah be pleased with them) submitted: O Messenger of Allah! You fast continuously in this manner. The Noble Prophet (peace and blessings be upon him) said: In this matter, you are not like me. I spend the night in such a state that my Lord Himself feeds and gives me drink. Therefore, you should only take on as much practice as you have the strength to bear.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 7162