Hadith 4:649
Sharīk narrated to us, from al-Aswad, from Qays, from his father, from ‘Umar, who said: There is no harm in making up [the missed days of] Ramaḍān during the ten [days of Dhū al-Ḥijjah].
حدثنا شريك عن الأسود عن قيس عن أبيه عن عمر قال لا بأس بقضاء رمضان في العشر