عَنْ عَلِيٍّ رَضِيَ اللَّهُ عَنْهُ أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ كَانَ يُوَاصِلُ مِنَ السَّحَرِ إِلَى السَّحَرِ
It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) used to observe continuous fasting from one pre-dawn meal (suhoor) to the next.