This is my favorite adoption scripture. Isaiah is talking about the last days:
"Sing, O barren, thou that didst not bear; break forth into singing, and cry aloud, thou that didst not travail with child: for more are the children of the desolate than the children of the married wife, saith the Lord. Enlarge the place of they tent, and let them stretch forth the curtains of thine habitations: spare them not." Isaiah 54:1-2
Adoption is a wonderful calling!