Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated that the Messenger of Allah (peace and blessings be upon him) said: When the month of Ramadan comes, all the gates of the heavens are opened, the gates of Hell are closed, and the devils are chained.

Sayyiduna Abdullah bin Umar (may Allah be pleased with them) narrates that the Messenger of Allah (peace and blessings be upon him) mentioned Ramadan and said: Do not begin fasting until you see the moon, and likewise, do not end the fast until you see the moon. And if it is cloudy, then complete thirty days.

Sayyiduna Ibn Umar narrated that the Prophet Muhammad (peace and blessings be upon him) said: "A month is of such and such and such and such days." By this, he meant thirty days. Then he said: "And such and such and such and such days." His indication was towards twenty-nine days. Once, he pointed towards thirty, and on another occasion, towards twenty-nine.

Sayyiduna Ibn Umar (may Allah be pleased with them both) narrated that the Prophet Muhammad (peace and blessings be upon him) said: We are an unlettered nation; we neither write nor calculate. The month is like this and like this. He meant sometimes twenty-nine (days) and sometimes thirty (days). (He indicated with all his ten fingers three times.)

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrated that the Prophet Muhammad (peace and blessings be upon him) said, or he said that Abu al-Qasim (peace and blessings be upon him) said: "Begin fasting upon sighting the moon and end fasting upon sighting the moon, and if it is cloudy, then complete thirty days."

Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates that the Noble Prophet (peace and blessings be upon him) said: None of you should fast a day or two before Ramadan (in the last days of Sha'ban), except for a person who has a habit of fasting on those days, then he may fast on that day.

Sayyida Umm Salama (may Allah be pleased with her) narrated that the Prophet Muhammad (peace and blessings be upon him) swore an oath (due to an incident) that he would not go to some of his wives for a month. Then, when twenty-nine days had passed, the Messenger of Allah (peace and blessings be upon him) went to them either in the morning or in the evening. It was said to the Messenger of Allah (peace and blessings be upon him), "You had sworn an oath that you would not come for a month?" He replied, "A month can also be of twenty-nine days."

Sayyiduna Abu Bakrah (may Allah be pleased with him) narrated that the Noble Prophet (peace and blessings be upon him) said: Both months are never deficient. The months referred to are the months of Eid, Ramadan and Dhul-Hijjah.

Sayyiduna ‘Adi bin Hatim (may Allah be pleased with him) narrated that when this verse was revealed:“until the white thread becomes distinct to you from the black thread”(Al-Baqarah 187), I took a black thread and a white thread and placed them under my pillow, and I kept looking at them during the night, but their colors did not become clear to me. When morning came, I went to the Messenger of Allah (peace and blessings be upon him) and mentioned this to him. He said,“It means the darkness of the night (false dawn) and the whiteness of the day (true dawn).”

Sayyiduna Sahl bin Sa’d (may Allah be pleased with him) narrated that the verse was revealed:“Eat and drink until the white thread becomes distinct to you from the black thread”(Al-Baqarah 187), but the words“of the dawn”had not yet been revealed. Because of this, some people, when intending to fast, would take a black and a white thread and tie them to their feet, and they would not stop eating and drinking until both threads became clearly visible. Then Allah the Exalted revealed the words“of the dawn,”and then people realized that what was meant was the night and the day.