'Solemn' in the Bible

So now, promise me this with an oath sworn in the Lord's name. Because I have shown allegiance to you, show allegiance to my family. Give me a solemn pledge

Indeed, for forty years the Israelites traveled through the desert until all the men old enough to fight when they left Egypt, the ones who had disobeyed the Lord, died off. For the Lord had sworn a solemn oath to them that he would not let them see the land he had sworn on oath to give them, a land rich in milk and honey.

At that time Joshua made this solemn declaration: "The man who attempts to rebuild this city of Jericho will stand condemned before the Lord. He will lose his firstborn son when he lays its foundations and his youngest son when he erects its gates!"

That day Moses made this solemn promise: 'Surely the land on which you walked will belong to you and your descendants permanently, for you remained loyal to the Lord your God.'

or associate with these nations that remain near you. You must not invoke or make solemn declarations by the names of their gods! You must not worship or bow down to them!