NET
27 This is the one about whom it is written, ‘Look, I am sending my messenger ahead of you, who will prepare your way before you.’
Darby
27 This is he concerning whom it is written, Behold, *I* send my messenger before thy face, who shall prepare thy way before thee;
KJV
27 “This is” [he], “of whom it is written, Behold, I send my messenger before thy face, which shall prepare thy way before thee.”