6 days of fasting in Shawwal Month

“Anyone who fasts in the month of Ramadhaan
and follows it with 6 Days of Fasting in the Month
of Shawwal, it is as though he has fasted for the
full life, fast perpetually or fasted for 1 year, the
Arabic word is Dahar, it means perpetually or full
life.”

Sahih Muslim Vol. no. 2, Hadith no. 2614