Many by the gift of God here understand Christ, whom God gave to the world, Joh_3:16; and who is the greatest gift that God ever gave to the world; so as the latter words, who it is, &c., expound the former.
Thou wouldst have asked of him, and he would have given thee, either a true knowledge of the doctrine or the grace tendered in the gospel; or the Holy Spirit, called water, because it washes and cleanses the soul; and
living water, because it is always running and flowing.