What is the ruling on one who continues to eat after knowing that it is the first day of Ramadan and that the fast is confirmed?

Question:
On the first day of the month of Ramadan, it was not confirmed to us that it was a definite day of fasting, but shortly after, we were told that it was a definite day of fasting, and praise be to Allah. However, there is a woman who, after knowing that it was a definite day of fasting, continued to eat. Does she have a sin or an expiation to pay? What is the ruling of the Shari'ah regarding that action? If one does not know about the beginning of Ramadan until during the day...

Answer:
Yes. He must abstain for the rest of that day, and not eat or drink, and he must make up this day, because he did not fast it completely, as a period passed during which he did not fast, which was after the dawn. So, when he knows that the month has entered, he must abstain for the rest of his day, and not eat or drink, and he must perform the work of the day, but he must fast this day on another day, because he did not fast it while in a state of fasting, as a period passed during which he did not complete the fast.