360
Śrīmad-Bhāgavatam
[Canto 1, Ch. 7]
PURPORT
Arjuna was a great soul undoubtedly, which is proved here also. He is encouraged herein personally by the Lord to kill the son of Droṇa, but Arjuna considers that the son of his great teacher should be spared, for he happens to be the son of Droṇācārya, even though he is an unworthy son. He had done all sorts of heinous acts whimsically for no one's benefit.
Lord Śrī Kṛṣṇa encouraged Arjuna outwardly just to test Arjuna's sense of duty. It is not that Arjuna was incomplete in the sense of his duty, nor was Lord Śrī Kṛṣṇa unaware of Arjuna's sense of duty. But Lord Śrī Kṛṣṇa put to test many of His pure devotees just to magnify the sense of duty. The  gopīs  were put to such tests as well. Prahlāda Mahārāja also was put to such a test. All pure devotees come out successful in the respective tests by the Lord.
TEXT 41
अथोपेत्य स्वशिबिरं गोविन्दप्रियसारथिः । न्यवेदयत्तं प्रियायै शोचन्त्या अत्मजान् हतान् ॥४१॥
athopetya sva-śibiram govinda-priya-sārathiḥ nyavedayattam priyāyai śocantyā ātma-jān hatān
atha—thereafter; upetya—having reached; sva—own; śibiram—camp; govinda—one who enlivens the senses (Lord Śrī Kṛṣṇa); priya—dear; sārathiḥ—the charioteer; nyavedayat—entrusted to; tam—him; priyāyai—unto the dear; śocantyā—lamenting for; ātma-jān—own sons; hatān—murdered.
TRANSLATION
After reaching his own camp, Arjuna, along with his dear friend and charioteer [Śrī Kṛṣṇa], entrusted the murderer unto his dear wife, who was lamenting for her murdered sons.
PURPORT
The transcendental relation of Arjuna with Kṛṣṇa is of the dearmost friendship. In the  Bhagavad-gītā  the Lord Himself has claimed Arjuna as