O, so and so, did you observe fast in the middle of the month? He said: No. Thereupon he (the Messenger of Allah) said: When you break it, then observe fast for two days.
يَسْمَعُ يَا فُلاَنُ أَصُمْتَ مِنْ سُرَّةِ هَذَا الشَّهْرِ قَالَ لاَ قَالَ فَإِذَا أَفْطَرْتَ فَصُمْ يَوْمَيْنِ