At the end of chapter one, Arjuna puts his bow down and sits in his chariot. His last words in the chapter, 1.46, are a surrender to death: let them kill me, unresisting and unarmed. That would be better for me.
In Sanskrit the verse turns on one small word: mām. Me. If they slay me.
125 verses later, at 4.9, Kṛṣṇa uses the same word for the opposite purpose. Whoever truly knows my divine birth and action is not born again: mām eti. He comes to me.
The first mām is a man giving himself up to the enemy. The second is a voice offering a place to come home to. The same word, carrying a man away and calling him back.
The Gītā’s hero begins by giving up. His teacher answers with the word he gave up.
Going deeper
1.46 is the last thing Arjuna says in chapter 1. After 1.45, where he says they have resolved to commit a great sin, he says that if the well-armed sons of Dhṛtarāṣṭra were to kill him, unresisting and unarmed, that would be better for him. 1.47 then reports that he threw down his bow and sat on the chariot seat. Later, 4.8 says Kṛṣṇa is born from age to age to protect the good, destroy the wicked and establish dharma, and 4.9 says that whoever knows his divine birth and actions in truth is not reborn after leaving the body but comes to him. 4.10 adds that many, freed from desire, fear and anger and absorbed in him, have reached his state. In the Sanskrit both verses turn on the small word that means me. In one it is the target of an enemy's weapons, in the other it is where a person arrives. See chapter 1 and chapter 4.