Yudhishthir and Karna
Yudhishthir was the eldest son of King Pandu and he and his brothers were collectively known as the Pandavas. Pandu had been rendered impotent by a curse and his wives gave birth to the children by invoking the blessings of various demi-Gods. Kunti gave birth to Yudhishthir, Bhim and Arjun by invoking Dharma the God of Universal Law, Pavana the Wind God and Indra the King of Gods respectively. His second wife Madri gave birth to Nakula and Sahadeva by invoking the twin suns of the Sun God.
They first went to Yudhishthir and introduced themselves as merchants from a neighbouring town. They said that they were building a marriage hall and had run out of sandalwood. They needed a certain quantity of sandalwood to complete their task. Since they were not familiar with this city and they had heard a lot about Yudhishthir's generosity they were approaching him for assistance. Yudhishthir ordered a servant to collect the sandalwood from the timber merchants and invited the disguised Krishna and Arjun to have dinner with him. Dinner was soon over but there was no news from the servant. Instead of retiring at his usual time Yudhishthir stayed awake with his two guests attending to their every comfort. It was late when the servant returned. He had manages to procure a small quantity of sandalwood, but because of the untimely rains large stocks had become wet and hence unusable. Yudhishthir promised to have the procured quantity delivered the next day and requested the merchants to restart work. The remainder would be sent as soon as it dried and became usable.