The Cave - 18:17
When dawn came, while they were in the cave, you used to see the sun moving to the right over their cave, and when it set, you used to see it licking them and sliding to the left. This is one of the signs of Allah. Whomsoever Allah guides, he has found the truth; and whomsoever He leads astray, for him you will not find a friend who will enlighten.
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.