Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "Do not fast before the sighting of the crescent of Ramadan (as a precaution), however (if someone has a habit of fasting and it coincides with that day, then he may fast). Begin fasting upon sighting the crescent and end fasting upon sighting it. If it is cloudy, then complete the count to thirty and then end fasting." All the narrators of this narration are trustworthy.