But he who was healed didn't know who it was, for Jesus had withdrawn, a crowd being in the place.
      (2.) What he said to him. When Christ has cured us, he has not done with us; he now applies himself to the healing of his soul, and this by the word too. [1.] He gives him a memento of his cure: Behold thou art made whole. He found himself made whole, yet Christ calls his attention to it. Behold, consider it seriously, how sudden, how strange, how cheap, how easy, the cure was: admire it; behold, and wonder: Remember it; let the impressions of it abide, and never be lost, Isaiah 38:9. [2.] He gives him a caution against sin, in consideration hereof, Being made whole, sin no more. This implies that his disease was the punishment of sin; whether of some remarkably flagrant sin, or only of sin in general, we cannot tell, but we know that sin is the procuring cause of sickness, Psalms 107:17; Psalms 107:18. Some observe that Christ did not make mention of sin to any of his patients, except to this impotent man, and another who was in like manner diseased, Mark 2:5. While those chronical diseases lasted, they prevented the outward acts of many sins, and therefore watchfulness was the more necessary when the disability was removed. Christ intimates that those who are made whole, who are eased of the present sensible punishment of sin, are in danger of returning to sin when the terror and restraint are over, unless divine grace dry up the fountain. When the trouble which only dammed up the current is over, the waters will return to their old course; and therefore there is great need of watchfulness, lest after healing mercy we return again to folly. The misery we were made whole from warns us to sin no more, having felt the smart of sin; the mercy we were made whole by is an engagement upon us not to offend him who healed us. This is the voice of every providence, Go and sin no more. This man began his new life very hopefully in the temple, yet Christ saw it necessary to give him this caution; for it is common for people, when they are sick, to promise much, when newly recovered to perform something, but after awhile to forget all. [3.] He gives him warning of his danger, in case he should return to his former sinful course: Lest a worse thing come to thee. Christ, who knows all men's hearts, knew that he was one of those that must be frightened from sin. Thirty-eight years' lameness, one would think, was a thing bad enough; yet there is something worse that will come to him if he relapse into sin after God has given him such a deliverance as this, Ezra 9:13; Ezra 9:14. The hospital where he lay was a melancholy place, but hell is much more so: the doom of apostates is a worse thing than thirty-eight years' lameness.