New Revised Standard Version
They took an oath to the LORD with a loud voice, and with shouting, and with trumpets, and with horns.

Contemporary English Version
The crowd solemnly agreed to keep their promise to the LORD, then they celebrated by shouting and blowing trumpets and horns.

New American Bible
They swore an oath to the LORD with a loud voice, with shouting and with trumpets and horns.

Douay-Rheims Bible
And they swore to the Lord with a loud voice with joyful shouting, and with sound of trumpet, and sound of cornets,

And they swore to the Lord with a loud voice with joyful shouting, and with sound of trumpet, and sound of cornets,

sware

Nehemiah 5:13 Moreover I shook my lap, and said: So may God shake every man that shall not accomplish this word, out of his house, and out of his labours, thus may he be shaken out, and become empty. And all the multitude said: Amen. And they praised God. And the people did according to what was said.

Nehemiah 10:29 All that could understand, promising for their brethren, with their chief men, and they came to promise, and swear that they would walk in the law of God, which he gave in the hand of Moses the servant of God, that they would do and keep all the commandments of the Lord our God, and his judgments and his ceremonies.

trumpets

Psalm 81:1-4 Unto the end, for the winepresses, a psalm for Asaph himself. [2] Rejoice to God our helper: sing aloud to the God of Jacob. . . .