Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Do not practise continuous fasting (wisal); whoever of you wishes to practise wisal, let him continue only until the pre-dawn (suhur)." They said: O Messenger of Allah! But you (peace and blessings be upon him) also practise wisal. He (peace and blessings be upon him) said: "I am not like you; indeed, I have one who feeds me and gives me food, and one who gives me drink."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيام / 8379