Bg 2.37

hato va prapsyasi svargam
jitva va bhoksyase mahim
tasmad uttistha kaunteya
yuddhaya krta-niscayah

Word for word: 
hatah — being killed; va — either; prapsyasi — you gain; svargam — the heavenly kingdom; jitva — by conquering; va — or; bhoksyase — you enjoy; mahim — the world; tasmat — therefore; uttistha — get up; kaunteya — O son of Kunti; yuddhaya — to fight; krta — determined; niscayah — in certainty.

Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
O son of Kunti, either you will be killed on the battlefield and attain the heavenly planets, or you will conquer and enjoy the earthly kingdom. Therefore, get up with determination and fight.

Purport by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
Even though there was no certainty of victory for Arjuna’s side, he still had to fight; for, even being killed there, he could be elevated into the heavenly planets.