I don't get it. Does the Quran say that Prophets are infallible and incapable of sin?

No.

>>18614440
>Shaykh al-Islam Ibn Taymiyah (may Allah have mercy on him) said: The view that the Prophets were infallible and protected from committing major sins, but not minor sins, is the view of the majority of Muslim scholars and of all the sects… It is also the view of most of the scholars of tafseer and hadith, and the fuqaha’. Indeed nothing was narrated from the early generations, the leading scholars, the Sahaabah and Taabi‘een and those who followed them except that which is in accordance with this view. End quote from Majmoo‘ al-Fataawa, 4/319 - https://islamqa.info/en/answers/248875/infallibility-of-the-prophets

1 Kings 13:15-27

So the prophet said to him, “Come home with me and eat.”

The man of God said, “I cannot turn back and go with you, nor can I eat bread or drink water with you in this place. I have been told by the word of the Lord: ‘You must not eat bread or drink water there or return by the way you came.’”

The old prophet answered, “I too am a prophet, as you are. And an angel said to me by the word of the Lord: ‘Bring him back with you to your house so that he may eat bread and drink water.’” (But he was lying to him.) So the man of God returned with him and ate and drank in his house.

While they were sitting at the table, the word of the Lord came to the old prophet who had brought him back. He cried out to the man of God who had come from Judah, “This is what the Lord says: ‘You have defied the word of the Lord and have not kept the command the Lord your God gave you. You came back and ate bread and drank water in the place where he told you not to eat or drink. Therefore your body will not be buried in the tomb of your ancestors.’”

When the man of God had finished eating and drinking, the prophet who had brought him back saddled his donkey for him. As he went on his way, a lion met him on the road and killed him, and his body was left lying on the road, with both the donkey and the lion standing beside it. Some people who passed by saw the body lying there, with the lion standing beside the body, and they went and reported it in the city where the old prophet lived.

When the prophet who had brought him back from his journey heard of it, he said, “It is the man of God who defied the word of the Lord. The Lord has given him over to the lion, which has mauled him and killed him, as the word of the Lord had warned him.”

>>18615099
So obviously Jonah only committed minor sins. Wham, bam, thank you ma'am.

>>18614440
They rewrite them to be completely different men. It's new people with names of prophet.

>>18615109
>disobeying God and traveling in another direction is a minor sin