Acts 9

In vision, the Lord told Ananias to got bless Saul to receive his sight.  It appears Ananias basically responded "You have got to be kidding me".  But the most important lesson is that Ananias, at great risk and great faith, was obedient and -

"...went his way, and entered into the house; and putting his hands on him said, Brother Saul, the Lord, even Jesus, that appeared unto thee in the way as thou camest, hath sent me, that thou mightest receive thy sight, and be filled with the Holy Ghost."  (Acts 9:17)

Probably to his surprise, that  -

"...immediately there fell from his eyes as it had been scales: and he received sight forthwith, and arose, and was baptized."  (Acts 9:18)

What a special experience of faith and obedience.