They stand fast for ever - סמוכים semuchim, they are propped up, buttressed, for ever. They can never fail; for God's power supports his works, and his providence preserves the record of what he has done.

they

Matthew 5:18 For truly I say to you, Till heaven and earth pass, one stroke or one pronunciation mark shall in no wise pass from the law...

Romans 3:31 Do we then make void the law through faith? God forbid: yes, we establish the law.

stand fast. Heb. are established
are done

Psalm 19:9 The fear of the LORD is clean, enduring for ever: the judgments of the LORD are true and righteous altogether.

Psalm 119:127,128 Therefore I love your commandments above gold; yes, above fine gold...

Romans 7:12 Why the law is holy, and the commandment holy, and just, and good.

Revelation 15:3 And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvelous are your works...

The Ordinance of Covenanting
THE ORDINANCE OF COVENANTING. BY JOHN CUNNINGHAM, A.M. "HE HATH COMMANDED HIS COVENANT FOR EVER." Ps. cxi. 9. "THOUGH IT BE BUT A MAN'S COVENANT, YET IF IT BE CONFIRMED, NO MAN DISANNULETH, OR ADDETH THERETO." Gal. iii. 15. GLASGOW:--WILLIAM MARSHALL. SOLD ALSO BY JOHN KEITH. EDINBURGH:--THOMAS NELSON AND JOHN JOHNSTONE. LONDON:--HAMILTON, ADAMS, & CO. MANCHESTER:-GALT & ANDERSON. BELFAST:--WILLIAM POLLOCK. TO THE REVEREND ANDREW SYMINGTON, D.D., PROFESSOR OF DIVINITY IN THE REFORMED PRESBYTERIAN …
John Cunningham—The Ordinance of Covenanting

Covenanting According to the Purposes of God.
Since every revealed purpose of God, implying that obedience to his law will be given, is a demand of that obedience, the announcement of his Covenant, as in his sovereignty decreed, claims, not less effectively than an explicit law, the fulfilment of its duties. A representation of a system of things pre-determined in order that the obligations of the Covenant might be discharged; various exhibitions of the Covenant as ordained; and a description of the children of the Covenant as predestinated …
John Cunningham—The Ordinance of Covenanting

Period ii. The Church from the Permanent Division of the Empire Until the Collapse of the Western Empire and the First Schism Between the East and the West, or Until About A. D. 500
In the second period of the history of the Church under the Christian Empire, the Church, although existing in two divisions of the Empire and experiencing very different political fortunes, may still be regarded as forming a whole. The theological controversies distracting the Church, although different in the two halves of the Graeco-Roman world, were felt to some extent in both divisions of the Empire and not merely in the one in which they were principally fought out; and in the condemnation …
Joseph Cullen Ayer Jr., Ph.D.—A Source Book for Ancient Church History