Rabi‘ reported it from a Companion: "Do not begin fasting (before the month starts) until you have sighted the crescent of the first (day); before that (do not begin fasting) until you have completed the count of thirty, and (do not stop fasting) until you have completed the count of thirty."

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: The Noble Prophet (peace and blessings be upon him) said: "Do not begin fasting until you see the new moon, and do not end it until you see the new moon. If it is cloudy, then complete thirty days of fasting." This narration is also transmitted in Muwatta from Nafi', from Ibn Dinar, from Ibn Umar (may Allah be pleased with them both), in which these words are mentioned: "Complete its count."

Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) narrates: The Noble Prophet (peace and blessings be upon him) said:“(The month) is sometimes twenty-nine days. Do not begin fasting until you see it (the crescent of Ramadan), and do not stop fasting until you see it (the crescent of Shawwal). If it is cloudy, then complete the count.”(The narrator named Ibn Murshid has transmitted this additional statement: Nafi’ narrates) When twenty-nine days of Sha’ban had passed, Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would tell someone to look for the crescent. If it was sighted, that was fine; if it was not sighted, and there was no cloud or dust obstructing the sighting, then Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would not fast the next day. But if it was not sighted and there was dust or cloud obstructing the sighting, then Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would fast the next day. The narrator states: Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would end fasting along with the people.

Rabi' bin Hirash narrates from the Prophet Muhammad (peace be upon him): The Prophet (peace be upon him) said: "Beware! Do not fast (as a precaution) before the (month of Ramadan) until you see the crescent, or complete the count of thirty days. And do not stop fasting until you see the crescent (or complete the count)." All the narrators of this narration are trustworthy.

Rabi' bin Hirash narrates from a companion of the Prophet (peace be upon him): The Prophet (peace be upon him) said: "Do not fast (as a precaution) before the (month of Ramadan); do not begin fasting until you see the crescent or complete the count of thirty days. Then begin fasting, and do not stop fasting until you see (the crescent of Shawwal) or complete the count of thirty days."

This narration is also transmitted with another chain, which is similar to it.

Abu Bakhtari narrates: We saw the moon of Eid at the place of Dhat Shaquq, and we were in doubt about it—whether it was the moon of the first, second, or third night. So we sent a person to Sayyiduna Abdullah ibn Abbas (may Allah be pleased with them). Sayyiduna Abdullah ibn Abbas (may Allah be pleased with them) said: "Allah the Exalted has connected this command with the sighting of the moon. If clouds cover you, then complete the count of thirty days of Sha'ban." This narration is authentic as transmitted from Shu'bah; other narrators have transmitted it from Amr ibn Murrah. Only the narrator named Adam has mentioned the words "the count of Sha'ban" in this hadith, and this narrator is trustworthy.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said (the narrator is in doubt, perhaps these are the words): Sayyiduna Abu al-Qasim (peace and blessings be upon him) said: "Begin fasting upon sighting it (the new moon of the first) and end fasting upon sighting it, and if it is cloudy, then complete the count to thirty." Imam Daraqutni states: That is, complete the count of thirty days of Sha'ban. This narration, as transmitted from Shu'bah, is authentic; Imam Bukhari (may Allah have mercy on him) has transmitted this narration from Shu'bah through Adam, and in it are these words: "You should complete the count of thirty days of the month of Sha'ban." In this narration, the word "that is" has not been transmitted.

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Noble Prophet (peace and blessings be upon him) said: "Keep count of the crescent of Sha'ban for Ramadan, and do not join Sha'ban with Ramadan (by fasting continuously), except for a person who has a habitual fast on that day (then his ruling is different). Begin fasting by sighting the crescent (of Ramadan) and stop fasting by sighting it (of Shawwal), and if it is cloudy, then completing the count will not be difficult for you."

Sayyiduna Qais bin Talq narrates from his father: The Noble Prophet (peace and blessings be upon him) said: "Allah Almighty has made the new moon for people to calculate the days. When you see it, start fasting, and when you see it, stop fasting. And if clouds cover you, then complete the count to thirty." The narrator Muhammad bin Jabir states: I have heard this narration from him, and in addition, I have heard two more narrations. The narrator named Muhammad bin Jabir is not reliable; he is weak.