This is a traditional Jewish story, not found in the Torah.

Long, long ago, Abraham lived in the country of Ur. The people of Ur worshipped statues made of wood and stone. In his heart, Abraham felt that these pieces of wood and stone were not worthy of worship. They were cold, useless objects, which could do nothing. They could not possibly be gods. So, one night, Abraham went in search of one true GOD.

He looked up in the sky and saw the moon shining brightly. 'The moon lights up the night sky,' Abraham said to himself. 'The moon guides travellers. The moon must be GOD'. Abraham worshipped the moon all night. But when morning came, the moon disappeared and the sun rose in the sky.

The sun was bigger and brighter than the moon. 'Without the sun, nothing would grow,' said Abraham to himself. 'The sun must be GOD'. Abraham worshipped the sun all day. But when evening came, the sun disappeared.

'The sun is not GOD and the moon is not GOD', said Abraham. 'God is the One who makes them rise and fall in the sky. He is the One who has shown me this. He alone is worthy of worship.'

So, Abraham returned to the city of Ur to tell the people there about the one true God.