The ruling on one who left the fasting of Ramadan out of ignorance of its obligation

Question: About ten years ago, I reached puberty through the known signs of puberty. However, in my first year of puberty, I encountered Ramadan and did not fast it without a valid religious excuse; rather, it was due to my ignorance of its obligation at that time. Do I now have to make up the fast? And do I have to pay an expiation in addition to making up the fast?

Answer: You must make up the fast for that month you did not fast, along with repentance and seeking forgiveness. In addition, you must feed one poor person for each day, the amount being half a sa' (a dry measure of about 3 kg) of the staple food of the country, whether dates, rice, or otherwise, if you are able to do so. However, if you are poor and unable to do so, nothing is required of you other than the fasting.