Tradition
St. Jerome
The Life of S. Hilarion
Section 45
45. His body was now all but cold, and nought was left of life but reason. Yet with eyes wide open he kept repeating, “Go forth, what do you fear? Go forth, my soul, why do you hesitate? You have served Christ nearly seventy years, and do you fear death?” Thus saying he breathed his last. He was immediately buried before the city heard of his death.
Source: The Life of S. Hilarion (New Advent)