Hazrat Ali (may Allah be pleased with him) said that some months are of twenty-nine days and some are of thirty days.

Hazrat Umar said that sometimes a month is of thirty days and sometimes of twenty-nine days.

Hazrat Abu Hurairah says that Ramadan is of twenty-nine days.

Hazrat Waleed bin Utbah says that during the time of Hazrat Ali (may Allah be pleased with him), we fasted for twenty-eight days in Ramadan without sighting the moon. On the day of Eid-ul-Fitr, he ordered us to make up one fast.

Hazrat Sha'bi says that we have observed at least twenty-nine and at most thirty fasts in Ramadan.