15 From there he went to fight against the people living in the town of Debir (formerly called Kiriath-sepher). 16 Caleb said, "I will give my daughter Acsah in marriage to the one who attacks and captures Kiriath-sepher." 17 Othniel, the son of Caleb's brother Kenaz, was the one who conquered it, so Acsah became Othniel's wife. 18 When Acsah married Othniel, she urged him to ask her father for a field. As she got down off her donkey, Caleb asked her, "What's the matter?" 19 She said, "Give me another gift. You have already given me land in the Negev; now please give me springs of water, too." So Caleb gave her the upper and lower springs.
Matthew Henry's Commentary on Joshua 15:15-19
Commentary on Joshua 15:13-19
(Read Joshua 15:13-19)
Achsah obtained some land by Caleb's free grant. He gave her a south land. Land indeed, but a south land, dry and apt to be parched. She obtained more, on her request, and he gave the upper and the nether springs. Those who understand it but of one field, watered both with the rain of heaven, and the springs that issued out of the earth, countenance the allusion commonly made to this, when we pray for spiritual and heavenly blessings which relate to our souls, as blessings of the upper springs, and those which relate to the body and the life that now is, as blessings of the nether springs. All the blessings, both of the upper and the nether springs, belong to the children of God. As related to Christ, they have them freely given of the Father, for the lot of their inheritance.