一切經音義 9.256

9.256

相和（胡臥反相應也詩云唱予和汝周易鳴鶴在陰其子和之是也）。

相和 [harmonizing with one another]: [The second character is pronounced with the] fanqie 胡臥 (hè). It means to respond to one another. The Classic of Poetry says: "I sing and you harmonize (和)." The Book of Changes says: "A crane calls in the shade, and its young harmonizes (和) with it." This is it.