Although they say, 'As surely as the LORD lives,' they are swearing falsely."

Titus 1:16
They profess to know God, but by their actions they deny Him. They are detestable, disobedient, and unfit for any good deed.

Isaiah 48:1
"Listen to this, O house of Jacob, you who are called by the name of Israel, who have descended from the line of Judah, who swear by the name of the LORD, who invoke the God of Israel--but not in truth or righteousness--

Jeremiah 44:26
Nevertheless, hear the word of the LORD, all you people of Judah living in Egypt: Behold, I have sworn by My great name, says the LORD, that never again will any man of Judah living in the land of Egypt invoke My name or say, 'As surely as the Lord GOD lives.'

Hosea 4:15
Though you prostitute yourself, O Israel, may Judah avoid such guilt! Do not journey to Gilgal, do not go up to Beth-aven, and do not swear on oath, 'As surely as the LORD lives!'

Zephaniah 1:5
those who bow on the rooftops to worship the host of heaven, those who bow down and swear by the LORD but also swear by Milcom,

Zechariah 5:3
Then he told me, "This is the curse that is going out over the face of all the land, for according to one side of the scroll, every thief will be removed; and according to the other side, every perjurer will be removed.

Malachi 3:5
"Then I will draw near to you for judgment. And I will be a swift witness against sorcerers and adulterers and perjurers, against oppressors of the widowed and fatherless, and against those who defraud laborers of their wages and deny justice to the foreigner but do not fear Me," says the LORD of Hosts.

And though they say, The LORD lives; surely they swear falsely.