Psalms 40:7 - Exposition

Then said I, Lo, I come: in the volume of the book it is written of me ; rather, then said I , Lo , I come with the roll of the book written concerning me. "Then" means "as soon as my ears were opened." "Lo, I come," marks ready and prompt obedience (see Numbers 22:38 ; 2 Samuel 19:20 ). The psalmist represents himself as brining with him "the roll of the book," i.e. the book of the Law in its ordinary form of a parchment roll, to show what it is that he is prepared to obey. This book, he says, is written "concerning him," since it contains precepts concerning a king's duties ( Deuteronomy 17:14-20 ).