Oil

Next, Abraham asked Zimran to search for more oil.

The third son of the old man followed the footsteps of Issac and returned to the forest. Instead of digging, he picked up the shiny stones left by his brother and brought them back to Abraham.

"Why! They are diamonds! You smart boy!" Abraham nodded.

The old man then sent Jokshan to try.

The fourth son headed north-east and, a few months later, reached a no-man's-land. Without the good fortune of Zimran, Jokshan had to dig for himself. Nonetheless, after several weeks of painstaking exertion, no trace of oil could be seen. However, he found a good many stones - no, not the shiny ones that his brother Isaac had carelessly threw away. He tried again and again to see if he could make use of this nondescript finding.

At last, he found that the stones could burn.

He brought them back to his father.

"Good lord. You find a coal mine! Clever boy." Abraham said approvingly.