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.
Hadith Referenceاللؤلؤ والمرجان / كتاب الصيام / 654
Hadith Gradingمحدثین:«صحیح»
Hadith Takhrij«صحیح، أخرجه البخاري في: 68 كتاب الطلاق: 25 باب اللعان وقول الله تعالى (والذين يرمون أزواجهم»