Leviticus 14:43

⁴³ But if, after the stones be taken out, and the dust scraped off, and it be plastered with other earth,

Turtles, and young pigeons

In Genesis 15:9 and Leviticus 12:6, this signifies the good of innocence; the young pigeon, interior good, and the turtle-dove exterior good. (Apocalypse Explained 314) They also represent exterior and interior spiritual things. (Arcana Coelestia 1727)