King James Version
So the father knew that it was at the same hour, in the which Jesus said unto him, Thy son liveth: and himself believed, and his whole house.English Standard Version
The father knew that was the hour when Jesus had said to him, "Your son will live." And he himself believed, and all his household.New International Version
Then the father realized that this was the exact time at which Jesus had said to him, "Your son will live." So he and all his household believed.