Final answer:
In John 4:52, the royal official inquired about the exact time his son began to recover, confirming it was the moment Jesus had told him his son would live.
Step-by-step explanation:
According to John 4:52, the royal official inquired about the precise time when his son started to get better.
After Jesus had told him that his son would live, the official wanted to confirm that the timing of his son's improvement corresponded with the moment Jesus had said those words. This event is a testament to the power of Jesus' words and the faith of the royal official.