Abu Hurairah reported,

The Messenger of Allah ﷺ said, "Whoever reaches Ramadan while still owing days from a previous Ramadan that he has not made up, his fast will not be accepted from him. And whoever fasts voluntarily while still owing days from Ramadan that he has not made up, it will not be accepted from him until he fasts those days."

Ahmad 8621

Daif

حدثنا حسن حدثنا ابن لهيعة حدثنا أبو الأسود عن عبد الله بن رافع

عن أبي هريرة

عن رسول الله ﷺ قال من أدرك رمضان وعليه من رمضان شيء لم يقضه لم يتقبل منه ومن صام تطوعا وعليه من رمضان شيء لم يقضه فإنه لا يتقبل منه حتى يصومه

أحمد 8621ضعيف
Contents
Reference
Commentary
Ayat
Collection
Musnad Ahmad
Book
Abu Hurairah
Numbering
Darussalam 8621
Ahmad 8621