Abu Ayyub al-Ansari (Allah be pleased with him) reported Allah's Messenger (ﷺ) as saying:He who observed the fast of Ramadan and then followed it with six (fasts) of Shawwal. it would be as if he fasted perpetually

Abu Ayyub al-Ansari reported (through another chain of transmitters):I heard Allah's Messenger (ﷺ) saying like this

Abu Ayyub reported a hadith like this (through another chain of transmitters)