The Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), narrates: "The fasts I kept with the Messenger of Allah (peace and blessings be upon him) of twenty-nine (days in a month) were more than those of thirty (days in a month)."
Imam al-Tabarani (may Allah have mercy on him) said: "This hadith is narrated from Sayyidah Aishah (may Allah be pleased with her) only with this chain; Ishaq bin Sa'id is alone in narrating it."
Hadith Referenceالمعجم الأوسط / باب الميم / 5249
Hadith Takhrij«أخرجه البيهقي فى «السنن الكبرى» برقم: 8297، وأحمد فى «مسنده» برقم: 25236»