Isaiah 8:16

In these verses we have, I. The unspeakable privilege which the people of God enjoy in having the oracles of God consigned over to them, and being entrusted with the sacred writings. That they may sanctify the Lord of hosts, may make him their fear and find him their sanctuary, bind up the testimony, Isa 8:16. Note, It is a great instance of God's care of his church and love to it that he has lodged in it the invaluable treasure of divine revelation. 1. It is a testimony and a law; not only this prophecy is so, which must therefore be preserved safely for the comfort of God's people in the approaching times of trouble and distress, but the whole word of God is so; God has attested it, and he has enjoined it. As a testimony it directs our faith; as a law it directs our practice; and we ought both to subscribe to the truths of it and to submit to the precepts of it. 2. This testimony and this law are bound up and sealed, for we are not to add to them nor diminish from them; they are a letter from God to man, folded up and sealed, a proclamation under the broad seal. The binding up and sealing of the Old Testament signified that the full explication of many of the prophecies of it was reserved for the New Testament times.

— Matthew Henry's Concise Commentary (public domain)

Bind up . . . seal--What Isaiah had before briefly noted by inscribing Maher-shalal-hash-baz in a tablet, fixed up in some public place, he afterwards wrote out more in detail in a parchment roll (Isa 30:8); this he is now to seal up, not merely in order that nothing may be added to, or taken from it, as being complete, but to imply that it relates to distant events, and is therefore to be a sealed and not understood testimony (Isa 6:9-10), except in part among God's "disciples," that is, those who "sanctify the Lord" by obedient trust (Psa 25:14). Subsequent revelations would afterwards clear up what now was dark. So the Apocalypse explains what in Daniel was left unexplained (compare Dan 8:26; Dan 12:9). "The words are closed up and sealed till the time of the end"; but Rev 22:10, "Seal not the sayings of the prophecy . . . for the time is at hand" (compare Rev 5:1, Rev 5:5, Rev 5:9), testimony--attested by Uriah and Zechariah (Isa 8:2). law--the revelation just given, having the force of a law. disciples--not as MAURER, Uriah and Zechariah (compare Joh 7:17; Joh 15:15).

— Jamieson-Fausset-Brown Commentary (public domain)