俱舍論疏 16.92

16.92

「論曰至共相應故」，明善業道加行、根本、後起皆從三善根生，皆是善心所等起故。從因等起心名之為善，善心與三善根相應故，由此諸善業道皆從三根生也。

[On the passage] from "The Śāstra says" up to "because they are mutually associated": this clarifies that the prayoga, maula, and pṛṣṭha of wholesome karmapathas all arise from the three wholesome roots, because they are all originated by a wholesome mind. Because they are originated from the causal mind, they are called wholesome; and because a wholesome mind is associated with the three wholesome roots, all wholesome karmapathas therefore arise from the three roots.