John 4:53 - Matthew Poole's English Annotations on the Holy Bible

The circumstance of the time when his son recovered agreeing with the very hour when Christ had said unto him, Thy son liveth, was a mighty confirmation to him, that he was beholden to Christ for his cure, and consequently that Christ was no ordinary man, more than a prophet, even the Son of God. This works upon his faith to a higher degree: he first believed the report of him, then he gave credit to the word that he spake, now he believeth savingly, and not he alone, but his whole family became Christians. Such instances we have concerning Lydia, Acts 16:14,15, the jailer, Acts 4:34, and Crispus, Acts 18:8.