The king

Psalm 2:6
"I have installed My King on Zion, upon My holy hill."

Psalm 21:1
O LORD, the king rejoices in Your strength. How greatly he exults in Your salvation!

1 Samuel 23:17
saying, "Do not be afraid, for my father Saul will never lay a hand on you. And you will be king over Israel, and I will be your second-in-command. Even my father Saul knows this is true."

1 Samuel 24:20
Now I know for sure that you will be king, and that the kingdom of Israel will be established in your hands.

sweareth

Deuteronomy 6:13
Fear the LORD your God, serve Him, and take your oaths using only His name.

Isaiah 19:18
In that day five cities in the land of Egypt will speak the language of Canaan and swear allegiance to the LORD of Hosts. One of them will be called the City of the Sun.

Isaiah 45:23
By Myself I have sworn; truth has gone out from My mouth, a word that will not be revoked: Every knee will bow before Me, every tongue will confess allegiance.

Isaiah 65:16
Whoever invokes a blessing in the land will do so by the God of truth, and whoever takes an oath in the land will swear by the God of truth. For the former troubles will be forgotten and hidden from My sight.

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

Hebrews 6:13
When God made His promise to Abraham, since He had no one greater to swear by, He swore by Himself,

the mouth

Psalm 31:18
May lying lips be silenced, which speak with arrogance against the righteous, full of pride and contempt.

Romans 3:19
Now we know that whatever the Law says, it says to those who are under the Law, so that every mouth may be silenced and the whole world held accountable to God.

Titus 1:10, 11
For many are rebellious and full of empty talk and deception, especially those of the circumcision, . . .