Tertullian

But why enlarge on such a subject? When the very apostle whom our heretics adopt, interprets the law which allows an unmuzzled mouth to the oxen that tread out the corn, not of cattle, but of ourselves; and also alleges that the rock which followed (the Israelites) and supplied them with drink was Christ; teaching the Galatians, moreover, that the two narratives of the sons of Abraham had an allegorical meaning in their course; and to the Ephesians giving an intimation that, when it was declared in the beginning that a man should leave his father and mother and become one flesh with his wife, he applied this to Christ and the church.