John 11:4

When Jesus heard that, He said, "This sickness is not unto death, but for the glory of God, that the Son of God may be glorified through it."

Surrounding context

11:3 Therefore the sisters sent to Him, saying, "Lord, behold, he whom You love is sick."

11:4 When Jesus heard that, He said, "This sickness is not unto death, but for the glory of God, that the Son of God may be glorified through it."

11:5 Now Jesus loved Martha and her sister and Lazarus.