Bhagavad Gita -Swami Sivananda
Duryodhana and Arjuna, from the side of the Kauravas and Pandavas respectively, were sent to Dwaraka to seek the help of the Yadava hero, Lord Krishna, in the battle. They both found Krishna resting on a couch in His palace. Duryodhana went in and occupied a seat at the head of the couch while Arjuna stood near the feet of the Lord. The moment Sri Krishna opened His eyes, He naturally saw Arjuna first, and then Duryodhana sitting on a chair. After enquiry of their welfare and the purpose of their visit, Sri Krishna, according to the prevailing custom, gave the first choice to Arjuna, because of his age, and also because of His sight of Arjuna first. Krishna asked Arjuna to fulfil his desire by selecting Him unarmed or His powerful army called Narayani Sena. Arjuna, who was a devotee of Sri Krishna, expressed his desire to have the Lord with him, neglecting the powerful Narayani Sena, even though Krishna warned that He would remain a witness, bound by the vow of not participating in battle and not taking up arms. Duryodhana, with great delight, thinking that Arjuna was foolish, expressed his wish for the powerful army to help his side in the battle.
When Krishna asked Arjuna why he chose Him when He was not for taking up arms, Arjuna said, “O Lord! You have the power to destroy all the forces by a mere sight. Why then should I prefer that worthless army? I have for a long time been cherishing a desire in my heart that you should act as my charioteer. Kindly fulfil my desire in this war.”
The Lord, who is ever the most devoted lover of His devotees, accepted his request with pleasure; and thus Krishna became the charioteer of Arjuna in the battle of the Mahabharata. After the return of Duryodhana and Arjuna from Dwaraka, Lord Krishna Himself went once to Hastinapura as the emissary of the Pandavas and tried to prevent the war.