Bg 18.74

sanjaya uvaca
ity aham vasudevasya
parthasya ca mahatmanah
samvadam imam asrausam
adbhutam roma-harsanam

Word for word: 
sanjayah uvaca — Sanjaya said; iti — thus; aham — I; vasudevasya — of Krishna; parthasya — and Arjuna; ca — also; maha-atmanah — of the great soul; samvadam — discussion; imam — this; asrausam — have heard; adbhutam — wonderful; roma-harsanam — making the hair stand on end.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Sanjaya said: Thus have I heard the conversation of two great souls, Krishna and Arjuna. And so wonderful is that message that my hair is standing on end.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
In the beginning of Bhagavad-gita, Dhrtarastra inquired from his secretary Sanjaya, “What happened on the Battlefield of Kuruksetra?” The entire study was related to the heart of Sanjaya by the grace of his spiritual master, Vyasa. He thus explained the theme of the battlefield. The conversation was wonderful because such an important conversation between two great souls had never taken place before and would not take place again. It was wonderful because the Supreme Personality of Godhead was speaking about Himself and His energies to the living entity, Arjuna, a great devotee of the Lord. If we follow in the footsteps of Arjuna to understand Krishna, then our life will be happy and successful. Sanjaya realized this, and as he began to understand it, he related the conversation to Dhrtarastra. Now it is concluded that wherever there is Krishna and Arjuna, there is victory.