It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that I am astonished at the person who fasts before the beginning of the month of Ramadan, even though the Messenger of Allah (peace and blessings be upon him) said: "When you see the crescent, then fast, and when you see (the crescent of Eid), then break your fast. If the sky is cloudy, then complete the count to thirty."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 334
Hadith Takhrijسنن نسائی، الصوم، باب ذكر الاختلاف على عمرو بن دينار ....... الخ ، رقم : 2125 وقال الالبانی: صحیح، مسند الحميدی، رقم : 5/3 ، مسند احمد : 405/3، رقم : 1931 وقال الارنوؤط: صحيح لغيره ، السنن الكبرى للبيهقي : 207/4
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that the Messenger of Allah (ﷺ) said: "When you see the moon, then fast, and when you see the moon, then break the fast. If the sky is cloudy, then complete the count to thirty." The narrator says that Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) would fast one day before seeing the moon. Ibrahim (may Allah have mercy on him) was asked if he also fasted one day before, and he said, "Yes."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 335
Hadith Takhrijسنن ابن ماجه ، الصيام، باب ماجاء في صومو الرؤتيه ......، رقم : 1654 وقال الالبانی: صحیح، مسند احمد : 402/10، رقم : 6323 وقال الارنوؤط: اسناده صحيح
It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (ﷺ) said: "Do not fast a day or two before Ramadan (as a means of welcoming it), except for a person who has a habit of fasting (such as on Thursdays, Mondays, or every other day), then if that day coincides with the days just before Ramadan, he may fast."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 336
Hadith Takhrijصحیح بخاری، الصوم، باب لا يتقدمن رمضان بصوم يوم ولا يومين، رقم : 1914 ، صحیح مسلم، الصيام، باب لا تتقدموا رمضان بصوم يوم أو يومیں، رقم : 1082
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings be upon him) mentioned Ramadan and said: "Do not fast before sighting the moon, and do not break the fast before sighting the moon. If the sky is cloudy, then complete thirty days."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 337
Hadith Takhrijصحیح بخاری، الصوم، باب قول النبي صلی اللہ علیہ وسلم اذا رأيتم الہلال فصوموا الخ، رقم : 1906 ، صحیح مسلم، الصيام، باب وجوب صوم رمضان لرؤية الہلال، رقم : 1080
It is narrated from Sayyiduna Abdullah bin Umar (may Allah be pleased with them) that the Messenger of Allah (peace and blessings be upon him) said: "The month can also be of twenty-nine days. Do not fast until you see the moon, and do not stop fasting until you see the moon. If it is cloudy, then complete the count to thirty."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 338
Hadith Takhrijصحیح بخاری، الصوم، باب قول النبى اذا رأيتم الہلال فصوموا، رقم : 1907، صحیح مسلم، الصيام، باب وجوب صوم رمضان لرؤية الہلال، رقم : 1080
It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Messenger of Allah, peace and blessings be upon him, said: "Do not fast one or two days before the month of Ramadan, except for someone who has a habitual fast and it coincides with that day, then he may fast. Fast upon sighting the crescent moon, and break your fast upon sighting the crescent moon. If the sky is cloudy, then complete the count to thirty, then celebrate Eid."
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 339
Hadith Takhrijسنن ترمذی، الصوم، باب لا تقدموا الشہر بصوم، رقم : 684 وقال حسن صحيح، وقال الالبانی: صحیح، مسند احمد : 278/16، رقم : 10451 وقال الارنوؤط: حدیث صحیح
Umar bin Salim Al-Zurqi (may Allah have mercy on him) narrates from his mother, she says: We were in Mina when Sayyiduna Ali bin Abi Talib (may Allah be pleased with him) was riding a camel and proclaiming: Indeed, the Messenger of Allah (peace and blessings be upon him) said: "These are days of eating and drinking; no one should fast during them." He was announcing this loudly while riding the camel behind the people.
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 340
Hadith Takhrijمسند احمد : 194/2، رقم : 824 وقال الارنوؤط اسنادہ صحیح
Abu Murrah (may Allah have mercy on him), the freed slave of Amr bin Al-As (may Allah be pleased with him), narrates: He and Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) went to Amr bin Al-As (may Allah be pleased with him) two days after Eid al-Adha. Sayyiduna Amr (may Allah be pleased with him) presented food, so Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) said, "I am fasting." Sayyiduna Amr (may Allah be pleased with him) said: "Break your fast, for in these days the Messenger of Allah (peace and blessings be upon him) commanded us to break the fast and forbade fasting on these days." Abu Murrah (may Allah have mercy on him) says that Sayyiduna Abdullah (may Allah be pleased with him) broke his fast, and both of them ate the food, and I ate with them.
Hadith Referenceالسنن المأثورة / باب ما جاء في تقدم الشهر / 341
Hadith Takhrijسنن ابی داؤد، الصوم، باب صيام ايام التشریق، رقم : 2418 وقال الالبانی: صحیح، مسند احمد : 302/29، رقم : 17768 وقال اسنادہ صحیح علی شرط الشيخین، السنن الکبری للبیہقی : 297/4 وصححہ ابن خزیمہ : 311/3، رقم : 2149، والحاکم : 435/1 و وافقہ الذہبی