The Messenger of Allah ﷺ said to me: Keep fast for three days of month, and finish the recitation of the Qur'an in one month. I and he differed among ourselves on period of time. He said: Fast one day and give it up other day. The narrator 'Ata said: The people differed from my father (in narrating the period of time). Some narrated seven days and others five.
لِي رَسُولُ اللَّهِ ﷺ صُمْ مِنْ كُلِّ شَهْرٍ ثَلاَثَةَ أَيَّامٍ وَاقْرَإِ الْقُرْآنَ فِي شَهْرٍ فَنَاقَصَنِي وَنَاقَصْتُهُ فَقَالَ صُمْ يَوْمًا وَأَفْطِرْ يَوْمًا قَالَ عَطَاءٌ وَاخْتَلَفْنَا عَنْ أَبِي فَقَالَ بَعْضُنَا سَبْعَةَ أَيَّامٍ وَقَالَ بَعْضُنَا خَمْسًا