Vow, and pay unto the Lord - Bind yourselves to him, and forget not your obligations.

Let all that be round about him - All the neighboring nations, who shall see God's judgments against his enemies, should

Bring presents unto him - Give him that homage which is due unto him.

That ought to be feared - למורא lammora, "to the terrible One;" lest they be consumed as the Assyrians have been.

vow

Psalm 50:14 Offer to God thanksgiving; and pay your vows to the most High:

Psalm 119:106 I have sworn, and I will perform it, that I will keep your righteous judgments.

Numbers 30:2 If a man vow a vow to the LORD, or swear an oath to bind his soul with a bond; he shall not break his word...

Ecclesiastes 5:4-6 When you vow a vow to God, defer not to pay it; for he has no pleasure in fools: pay that which you have vowed...

let all

Psalm 68:29 Because of your temple at Jerusalem shall kings bring presents to you.

Psalm 89:7 God is greatly to be feared in the assembly of the saints, and to be had in reverence of all them that are about him.

Deuteronomy 16:16 Three times in a year shall all your males appear before the LORD your God in the place which he shall choose...

2 Chronicles 32:22,23 Thus the LORD saved Hezekiah and the inhabitants of Jerusalem from the hand of Sennacherib the king of Assyria...

unto him. Heb. to fear

Genesis 31:42 Except the God of my father, the God of Abraham, and the fear of Isaac, had been with me, surely you had sent me away now empty...

Concerning Jonathan, one of the Sicarii, that Stirred up a Sedition in Cyrene, and was a False Accuser [Of the Innocent].
1. And now did the madness of the Sicarii, like a disease, reach as far as the cities of Cyrene; for one Jonathan, a vile person, and by trade a weaver, came thither and prevailed with no small number of the poorer sort to give ear to him; he also led them into the desert, upon promising them that he would show them signs and apparitions. And as for the other Jews of Cyrene, he concealed his knavery from them, and put tricks upon them; but those of the greatest dignity among them informed Catullus, …
Flavius Josephus—The Wars of the Jews or History of the Destruction of Jerusalem

Letter Xlv (Circa A. D. 1120) to a Youth Named Fulk, who Afterwards was Archdeacon of Langres
To a Youth Named Fulk, Who Afterwards Was Archdeacon of Langres He gravely warns Fulk, a Canon Regular, whom an uncle had by persuasions and promises drawn back to the world, to obey God and be faithful to Him rather than to his uncle. To the honourable young man Fulk, Brother Bernard, a sinner, wishes such joy in youth as in old age he will not regret. 1. I do not wonder at your surprise; I should wonder if you were not suprised [sic] that I should write to you, a countryman to a citizen, a monk …
Saint Bernard of Clairvaux—Some Letters of Saint Bernard, Abbot of Clairvaux

Covenanting Confers Obligation.
As it has been shown that all duty, and that alone, ought to be vowed to God in covenant, it is manifest that what is lawfully engaged to in swearing by the name of God is enjoined in the moral law, and, because of the authority of that law, ought to be performed as a duty. But it is now to be proved that what is promised to God by vow or oath, ought to be performed also because of the act of Covenanting. The performance of that exercise is commanded, and the same law which enjoins that the duties …
John Cunningham—The Ordinance of Covenanting