Bede the Venerable — as excerpted in the Catena Aurea on Mark 1:40-45

“(ubi sup.) Moreover, he doubted of the will of the Lord, not as disbelieving His compassion, but, as conscious of his own filth, he did not presume. It goes on; But Jesus, moved with compassion, put forth his hand, and touched him, and saith unto him, I will, be thou clean. It is not, as many of the Latins think, to be taken to mean and read, I wish to cleanse thee, but that Christ should say separately, I will, and then command, be thou clean.”