Theory:

“Do you see that?” said the Djinn. ‘‘That’s your very own humph that you’ve brought upon your very own self by not working. Today is Thursday, and you’ve done no work since Monday, when the work began. Now you are going to work.”

 

“How can I,” said the Camel, “with this humph on my back?”

 

‘‘That has a purpose,” said the Djinn, “all because you missed those three days. You will be able to work now for three days without eating, because you can live on your humph; and don’t you ever say I never did anything for you. Come out of the Desert and go to the Three, and behave.”

 

And the Camel went away to join the Three. And from that day to this the Camel always wears a humph (we call it ‘hump’ now, not to hurt his feelings); but he has never yet caught up with the three days that he missed at the beginning of the world, and he has never yet learned how to behave.

Rudyard Kipling

Explanation:
 
The Djinn asked whether the camel saw the hump that had formed on his back. He added that it was humph brought about by the camel himself because of not working. He pointed out that the camel had not done any work since Monday, and it was Thursday. He said the camel had to work now.
 
The camel asked how he could work with his humph on the back.
 
The Djinn answered that the humph had a purpose. Since the camel had missed work for three days, the humph will help him to store energy in the humph. Therefore the humph also had an advantage - the camel can work for three days without food now. The Djinn also said that the camel could not complain that the Djinn did not do anything for him. He told him to come out of the desert and meet the three animals - ox, horse and dog. He asked the camel to behave - it meant no more "humph-ing", and being sincere in duty and not dodging his work.
 
The camel went off to meet the three animals. So this is the story of how the camel got the humph - it always wears the humph (it is called as "hump" now - so that the camel's feelings are not hurt). But till date, the camel has not completed the three days work that he had missed at the beginning, nor has he learnt to behave, according to the author, Rudyard Kipling.
  
Rudyard Kipling is a famous writer and journalist. He has written many fictional stories and poems. His most notable work is "The Jungle Book" known by all kids. He was born in India in \(1865\) and moved later to the United Kingdom. He died in the year \(1936\), at the age of \(70\).
Reference:
National Council of Educational Research and Training (2008). How the camel got his hump - Rudyard Kipling (abridged) (pp. 01-06). Published at the Publication Division by the Secretary, National Council of Educational Research and Training, Sri Aurobindo Marg, New Delhi.