John Gills Exposition of the Bible Commentary - Deuteronomy 27:26
Cursed be he that confirmeth not all the words of this law to do them ,.... That is, who does not perfectly perform all that the law requires, and continues to do so; for the law requires obedience, and that perfect and constant, and in failure thereof curses, in proof of which the apostle produces this passage; see Gill on Galatians 3:10 , for the reconciliation of these Scriptures, as to what seeming difference there is between them: and all the people shall say, Amen ; See Gill... read more
Matthew Henry's Complete Commentary - Deuteronomy 27:11-26
When the law was written, to be seen and read by all men, the sanctions of it were to be published, which, to complete the solemnity of their covenanting with God, they were deliberately to declare their approbation of. This they were before directed to do (Deut. 11:29, 30), and therefore the appointment here begins somewhat abruptly, Deut. 27:12. There were, it seems, in Canaan, that part of it which afterwards fell to the lot of Ephraim (Joshua's tribe), two mountains that lay near together,... read more