JOHN 4:50-54 NKJV

Jesus said to him, “Go your way; your son lives.” So the man believed the word that Jesus spoke to him, and he went his way. And as he was now going down, his servants met him and told him, saying, “Your son lives!”

Then he inquired of them the hour when he got better. And they said to him, “Yesterday at the seventh hour the fever left him.” So the father knew that it was at the same hour in which Jesus said to him, “Your son lives.” And he himself believed, and his whole household.

This again is the second sign Jesus did when He had come out of Judea into Galilee.

JOHN 4:50-54 NKJV

John 4:50–54 The nobleman is said to have believed twice, once in v. 50 and  again in v. 53. In v. 50, he believed Jesus’ promise that his son would not die. But believing that Jesus can and will heal is not enough to save. What was it that the nobleman believed in v. 53? The explanation is found in v. 54. The miracle that Jesus performed was His second sign (2:11). These signs were performed so that people might believe that Jesus is the Christ, the Son of God, and that by believing they might have life (20:31). When the Jewish nobleman realized that his son had been healed, he knew that Jesus was more than a mere mortal. The nobleman and his household placed faith in Jesus and were born from above (3:3). Often in the NT entire households would express faith in Christ (compare Acts 10:44–48; 16:31–34).