Augustine of Hippo

He was granting pardon, but while he was granting it he raised his face to her and said, "Has no one stoned you?" And she did not say, "Why? What have I done, Lord? I'm not guilty, am I? That is not what she said. What she said was, "No one, Lord." She accused herself. They had been unable to prove it against her and had withdrawn. But she confessed, because her Lord was not unaware of her guilt but was nonetheless seeking her faith and her confession. "Has no one stoned you?" "No one, Lord." "No one"—that is confession of sins. …

Sermon 16A.5 ↗

Thomas Aquinas

Then (v 10), he shows that Jesus did not abandon mercy, but gave a merciful sentence. First, Jesus questions the woman; then forgives her; and finally, cautions her. Jesus questioned her about her accusers; thus he says that Jesus rising up, that is, turning from the ground on which he was writing and looking at the woman, asked her, Woman, where are those who accuse you? He asks about her condemnation saying, Has no one condemned you? And she answers, No one, Lord.

Commentary on John ↗

Bonaventure

"But Jesus, raising himself up," in which the fifth point is noted, namely the merciful liberation of the accused woman. And because mercy runs together with justice and is not against justice, the Lord asks her about condemnation and accusation. Therefore he says: "Woman, where are those who accused you? Has no one condemned you?" He asks two things, and because the one is evident from the departure of the accusers, the woman answers the question about condemnation.

Commentary on John, Chapter 8 ↗