'Swear Allegiance To The Lord' in the Bible

In that day five cities in the land of Egypt will speak the language of [the Hebrews of] Canaan and swear allegiance to the Lord of hosts. One [of them] will be called the City of Destruction.

I will remove those who worship the stars in the sky from their rooftops, those who swear allegiance to the Lord while taking oaths in the name of their 'king,'