Origen
Catena Aurea · Matthäusevangelium 1
Then Joseph her husband, being a just man, and not willing to make her a public example, was minded to put her away privily.
But if he had no suspicion of her, how could he be a just man, and yet seek to put her away, being immaculate? He sought, to put her away, because he saw in her a great sacrament, to approach which he thought himself unworthy.