This is about the time when the war between Kauravas and Pandavas was going on in Kurukshetra. Grandfather Bhishma was fighting the war on behalf of the Kauravas, but Duryodhana, the eldest brother of the Kauravas, felt that Bhishma Pitamah did not want to harm the Pandavas. Duryodhana believed that Pitamah Bhishma is very powerful and it is very easy for him to kill the Pandavas.
Duryodhana immersed in this thought reached Bhishma Pitamah. Duryodhana told Pitamah that you do not want to kill the Pandavas, that’s why you are not using any powerful weapon. After listening to Duryodhana, Bhishma said, “If you feel like this, I will kill all the five Pandavas tomorrow itself. I have five miraculous arrows, which I will use in the battle tomorrow. After listening to Bhishma Pitamah, Duryodhana said, “I do not trust you, so you give these five miraculous arrows to me. I will keep them safe in my room.’ Bhishma gave those five arrows to Duryodhana.
On the other hand, Shri Krishna came to know about this. He informed Arjuna about this. Arjun got scared hearing this and started thinking how to avoid this trouble.
Shri Krishna reminded Arjuna that once you had saved Duryodhana from the Gandharvas, then Duryodhana had told you that in return for this favor you can ask anything from me in future. This is the right time, you ask Duryodhana to bring those five miraculous arrows. In this way your and your brothers’ lives can be saved.
Shri Krishna’s advice to Arjuna was absolutely correct. He remembered Duryodhan’s promise. It is said that at that time everyone used to fulfill their given promises. Breaking a promise was considered against the rules. When Arjuna reminded Duryodhana of his promise and asked for five arrows, Duryodhana could not refuse. Duryodhana kept his promise and gave those arrows to Arjuna. In this way Shri Krishna protected his devotee Pandavas.