Question: I got married more than 30 years ago. I am Bedouin and illiterate and I have no religious knowledge. Moreover, there are no knowledgeable people around and we are in complete ignorance of the matters of our religion. However, I had sexual intercourse with my wife in Ramadaan after Fajr (Dawn) Prayer and she was willing. We broke our fast together that day and it was our first Ramadaan (i.e. in marriage). We were young and we did so thinking that being Junub (person in a state of major ritual impurity) because I slept with her during night and there was no water, it was impermissible to fast without Ghusl (full ritual bath following major ritual impurity). Therefore, I copulated with her after Fajr Prayer and we were ignorant of the related rulings.
Answer: It is obligatory on you to repent to Allaah (Exalted be He) and not do so again. Then, you have to do the required Kaffaarah (expiation), which is to emancipate a believing slave for each one of you. If this is not possible, each of you has to fast two successive months… read more here.