When the Pāṇḍavas were banished by Duryodhana and forced to live incognito in the forest, no one could trace out where they were staying. At that time, the great sage Nārada met Lord Kṛṣṇa and said, "My dear Mukunda, although You are the Supreme Personality of Godhead, the all-powerful person, by making friendship with You the Pāṇḍavas have become bereft of their legitimate right to the kingdom of the world—and, moreover, they are now living in the forest incognito. Sometimes they must work as ordinary laborers in someone else's house. These symptoms appear to be very inauspicious materially, but the beauty is that the Pāṇḍavas have not lost their faith and love for You, in spite of all these tribulations. In fact, they are always thinking of You and chanting Your name in ecstatic friendship."
Another example of acute affection for Kṛṣṇa is given in the Tenth Canto, Fifteenth Chapter, verse 18, of Śrīmad-Bhāgavatam. In the pasturing ground Kṛṣṇa felt a little tired and wanted to take rest, so He lay down on the ground. At that time, many cowherd boys assembled there and with great affection began to sing suitable songs so that Kṛṣṇa would rest very nicely.
There is a nice example of the friendship between Kṛṣṇa and Arjuna on the Battlefield of Kurukṣetra. When the fighting was going on, Aśvatthāmā, the son of Droṇācārya, unceremoniously attacked Kṛṣṇa, although according to the prevailing rules of chivalry one's chariot driver should never be attacked by the enemy. Aśvatthāmā behaved heinously in so many ways that he did not hesitate to attack Kṛṣṇa's body, although Kṛṣṇa was acting only as charioteer for Arjuna. When Arjuna saw that Aśvatthāmā was releasing various kinds of arrows to hurt Kṛṣṇa, he immediately stood in front of Kṛṣṇa to intercept all of them. At that time, although Arjuna was being harmed by those arrows, he felt an ecstatic love for Kṛṣṇa, and the arrows appeared to him like showers of flowers.
There is another instance of ecstatic love for Kṛṣṇa in friendship. Once when a cowherd boy named Vṛṣabha was collecting flowers from the forest to prepare a garland to be offered to Kṛṣṇa, the sun reached its zenith, and although the sunshine was scorching hot, Vṛṣabha felt it to be like the moonshine. That is the way of rendering transcendental loving service to the Lord; when devotees are put into great difficulties—even like the Pāṇḍavas, as described above—they feel all their miserable conditions to be great facilities for serving the Lord.
Another instance of Arjuna's friendship with Kṛṣṇa was described by Nārada, who reminded Kṛṣṇa, "When Arjuna was learning the art of shooting arrows, he could not see You for so many days. But when You arrived there, he stopped all His activities and immediately embraced You." This means that even though Arjuna was engaged in learning about the military art, he had not forgotten Kṛṣṇa for a moment, and as soon as there was an opportunity to see Kṛṣṇa, Arjuna immediately embraced Him.