Then the Levites shall proclaim in a loud voice to every Israelite:
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 (Deu 11:29, Deu 11:30), and therefore the appointment here begins somewhat abruptly, Deu 27:12.
Commenting on Deuteronomy 27:11-26
And the Levites shall speak, and say unto all the men of Israel,.... Rather, "answer (e) and say"; not the whole tribe of Levi, for that stood on Mount Gerizim to bless, Deu 27:12; but the priests of that tribe who were placed in the valley, between the two mountains, and pronounced both the blessings and the curses in the hearing of all the tribes...
Deu 27:14 “And the Levites shall lift up and speak to all the men of Israel with a high (loud)voice:” i.e., they shall pronounce the different formularies of blessing and cursing, turning towards the tribes to whom these utterances apply; and all the men of Israel shall answer “Amen,” to take to themselves the blessing and the curse, as uttered by them; just as in...