The following is an account of the death of the Great Teresa on October 4, 1582 at Alba de Tormes, by her secretary Blessed Anne of St. Bartholomew.
Two days before she died, she asked to be given the Most Holy Sacrament, for she knew now that she was dying. On seeing that they were bringing it to her, see sat up in bed in such a spirited way that it looked as if she were going to get up, so they had to restrain her. Then she said, with great joy: "My Lord, it is time to set out...." She gave hearty thanks to God that she was a daughter of the Church and was dying as such, saying that through the merits of Christ she hoped to be saved, and she asked us all to beseech God to pardon her sins and to look, not at them, but only at His own mercy. With great humility she asked pardon of all, telling them not to take into account the things she had done and the bad example she had set them.
When the sisters saw that she was dying, they begged her to say something to them that would be to their profit, and she entreated them, for the love of God, to keep strictly to their Rule and Constitutions. There was nothing that she wished to add to this. Afterwards, she said little more save for repeating again and again that verse of David which says: Sacrificium Deo spiritus contribulatus; cor contritum et humiliatum, Deus, non despicies ("A sacrifice to God is an afflicted spirit, a humble and contrite heart, O God, Thou wilt not despise." Psalm 50:19, The Vulgate) Especially the phrase cor contritum-- this she kept repeating till she could say no more. Before this she had asked for Extreme Unction which she received with great devotion.
On St. Francis' Day, at nine o'clock in the evening, Our Lord took her to be with Him and left us all in such sorrow and grief that, if I had to describe it here, there would be a great deal to say. I heard a few things which the Holy Mother said before she expired, but so wonderful are they that I shall not set them down here. My superiors can relate them if they think it well to do so.
(from Msgr. Doheny's Selected Writings of St. Teresa)