What is the Punishment of not Fasting in Ramadan?
Abu Umamah al-Bahili, may Allah be pleased with him, narrated:
-I have heard Allah's Messenger, peace and blessings upon him, say:
“While I was sleeping, two men came and, holding both of my arms, they brought me to a mountain which was hard to climb. And they said:
When I said “I can't.” they replied:
“We will make it easy for you.”
Thereupon, I started to climb the mountain. When we reached the middle, suddenly harsh voices were heard.
When I asked: “What are those voices?” they replied:
“The clamor of the people of Hell.”
We started again. We suddenly saw a group of people whose cheek pouches were split, and out of these pouches flew blood; and their feet were bound!
I asked: “Who are they?”
They replied: “They are those who eat their fasts before due time (those who don't fast).” (at-Targhib wa’t-Tarhib, 2:453.)