阿彌陀經疏 1.190

1.190

經曰：「聞是音者皆生念佛念法念僧」，次釋第三聞生善念。

The sūtra says: "Those who hear these sounds all generate mindfulness of the Buddha, mindfulness of the Dharma, and mindfulness of the Saṅgha." Next, this explains the third part, hearing and producing wholesome thoughts.