Ambrose of Milan

For the same reason was it that when Gideon was about to overcome the Midianites, he commanded three hundred men to take pitchers, and to hold lighted torches inside the pitchers, and trumpets in their right hands. Our predecessors have preserved the explanation received from the apostles, that the pitchers are our bodies, fashioned of clay, which do not know fear if they burn with the fervor of the grace of the Spirit, and bear witness to the passion of the Lord Jesus with a loud confession of the voice. …

On the Holy Spirit 1.143-46 ↗