It is narrated from Sayyiduna Ali (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) used to observe continuous fasting until Suhoor (i.e., after Iftar he would not eat or drink anything until Suhoor).
Hadith Referenceمسند احمد / مسند الخلفاء الراشدين / 700
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف لضعف عبدالأعلى الثعلبي