Bede

The voice of the turtledove has been heard in our land. The voice of the preacher has been heard in the land, which has now begun to be ours, having received the word of faith; of which it is said in the psalm of the first Sabbath, that is the resurrection of the Lord, which has become the first of the Sabbaths; "The earth is the Lord's, and the fullness thereof" (Psalm 23). …

Commentary on the Song of Songs ↗

Bernard of Clairvaux

1. "The voice of the turtledove has been heard in our land" (Song 2:12). I can by no means any longer conceal the fact that behold, for a second time, he who is from heaven speaks of the earth: assuredly so condescendingly, so companionably, as if he were one from the earth. …

Sermons on the Song of Songs, Sermon 59 ↗

Bonaventure

Third, there is the production of prophets similar to the multiplication of flowers. It is said of them in the Canticle: "The flowers appear on the earth... and the song of the dove is heard." Flowers appeared when the prophet said: "A shoot shall sprout from the stump of Jesse, and from his roots a bud shall blossom." But the song of the dove was heard when it was said: "How lonely she is now, the once crowded city! Widowed is she who was mistress over nations." For the turtle moans instead of singing.

Collations on the Hexaemeron, Collation 14 ↗