According to Osho, a master's death doesn't decide the fate of his teaching—the disciple's aliveness does. Words are dead or living according to your alert, open-hearted response. If you live the message now, it will keep resounding in you and naturally spread after he's gone. He relies on living disciples, not books: embodied understanding will carry his word, ignite others, and transform consciousness.
The teaching stays alive if you listen with your heart and live it, so it keeps shining even when the teacher is gone.