The Cow - 2:185
Ramadan is the month in which the Qur´an was sent down, a guidance for mankind, a clear teaching and a book of law. Whoever reaches that month, let him fast. And those of you who are sick or traveling, fast on the other days for the number of days that you cannot fast. Allah desires ease for you and not hardship. So that you may complete the number (of fasting days) and glorify and give thanks to Allah Who has guided you to the truth.
What is the right way?
Explained in Detail/41:30
"The angels descend upon those who follow the right path after saying: "Our Lord is Allah": "Fear not, grieve not, and rejoice in Paradise to which you are invited."
Mary/19:36
Allah is my Lord and your Lord; serve Him. This is the right way.
Yaseen/36:60
O children of Adam, did I not take a promise from you that you would not serve Satan? He is your open enemy.
Yaseen/36:61
Serve Me. This is the most right way.
The Family Of Imran/3:51
"Allah is my Lord and your Lord; serve Him. This is the right way."
The Ornaments of Gold/43:61
He (Jesus) is a source of knowledge and a sign about the Hour. So do not doubt about it (the Hour) and follow me. That is the right way.
The Ornaments of Gold/43:64
Allah is my Lord and your Lord, and to Him alone you should serve. This is the straight path.