Anas related that Rasulullah said: Take the Suhoor meal, for there is blessing in it (Bukhari, Muslim).
Ibn Umar related that the Prophet said: Do not start fasting unless you see the new moon, and do not end fasting until you see it. If the weather is cloudy then calculate when it should appear (Bukhari, Muslim).
“Taking the pre-dawn meal in Ramadan is a blessing, so do not leave it, be it just drinking a mouthful of water. For Allah the Noble and the Mighty, and His angels send blessings over those who have taken the pre-dawn meal” [Ahmad].