John Wesley on John 7:38

He that believeth - This answers to let him come to me. And whosoever doth come to him by faith, his inmost soul shall be filled with living water, with abundance of peace, joy, and love, which shall likewise flow from him to others. As the Scripture hath said - Not expressly in any one particular place. But here is a general reference to all those scriptures which speak of the effusion of the Spirit by the Messiah, under the similitude of pouring out water. Zec 14:8.