tapāmyaham ahaṁ varṣhaṁ nigṛihṇāmyutsṛijāmi cha
amṛitaṁ chaiva mṛityuśh cha sad asach chāham arjuna||19|| 

Meaning : O Arjuna, I give heat (as the sun), I hold back and send forth the rain. I am also immortality and death, and I am both the real (existence) and the unreal (non-existence).