It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, used to fast on Mondays and Thursdays. I inquired about it, so he, peace and blessings be upon him, said: "Deeds are presented (to Allah) on Mondays and Thursdays." (That is, on Monday and Thursday.)
Hadith Takhrijاس روایت کی سند حسن ہے۔ دیکھئے: [ترمذي 747] ، [بغوي فى شرح السنة 1799] ، [ابن ماجه 1740] ، [أبويعلی 6684] ، [ابن حبان 3644] ، [الحميدي 1005] ، [الترغيب والترهيب 124/2] ، [تلخيص الحبير 215/2] ، [نيل الأوطار 335/4] و [الأدب المفرد 61]
Brief Explanation
(Commentary on Hadith 1788)
It is understood that fasting on Mondays and Thursdays is Sunnah. Sayyiduna Usamah bin Zayd radi Allahu anhu was the servant of the Seal of the Messengers. Even in his old age, he did not consent to abandon this Sunnah (radi Allahu anhu wa ardah).