10 Jesus answered her, “If you knew the gift of God and who it is that asks you for a drink, you would have asked him and he would have given you living water.”

Read John 4:10 Using Other Translations

Jesus answered and said unto her,If thou knewest the gift of God, and who it is that saith to thee, Give me to drink; thou wouldest have asked of him, and he would have given thee living water.
Jesus answered her, "If you knew the gift of God, and who it is that is saying to you, 'Give me a drink,' you would have asked him, and he would have given you living water."
Jesus replied, “If you only knew the gift God has for you and who you are speaking to, you would ask me, and I would give you living water.”