﴿ يُرِيدُ ٱللَّهُ بِڪُمُ ٱلۡيُسۡرَ وَلَا يُرِيدُ بِڪُمُ ٱلۡعُسۡرَ ﴾
(Allah intends for you ease, and He does not want to make things difficult for you.)
Imam Ahmad recorded Anas bin Malik saying that Allah's Messenger said:
« يَسِّرُوا وَلَا تُعَسِّرُوا وَسَكِّنُوا وَلَا تُنَفِّرُوا »
(Treat the people with ease and don't be hard on them; give them glad tidings and don't fill them with aversion.)
This Hadith was also collected in the Two Sahihs. It is reported in the Sahihayn that Allah's Messenger said to Mu`adh and Abu Musa when he sent them to Yemen:
« بَشِّرَا وَلَا تُنَفِّرَا، وَيَسِّرَا وَلَا تُعَسِّرَا، وَتَطَاوَعَا وَلَا تَخْتَلِفَا »
(Treat the people with ease and don't be hard on them; give them glad tidings and don't fill them with aversion; and love each other, and don't differ.)
The Sunan and the Musnad compilers recorded that Allah's Messenger said:
« بُعِثْتُ بِالْحَنِيفِيَّةِ السَّمْحَة »
(I was sent with the easy Hanifiyyah (Islamic Monotheism).)
﴿ يُرِيدُ ٱللَّهُ بِڪُمُ ٱلۡيُسۡرَ وَلَا يُرِيدُ بِڪُمُ ٱلۡعُسۡرَ وَلِتُڪۡمِلُواْ ٱلۡعِدَّةَ ﴾
(Allah intends for you ease, and He does not want to make things difficult for you. (He wants that you) must complete the same number (of days)) means: You were allowed to break the fast while ill, while traveling, and so forth, because Allah wanted to make matters easy for you. He only commanded you to make up for missed days so that you complete the days of one month.