Isaiah 28:14-16

14 Therefore, hear the word of the Lord, O scoffers,
Who rule this people who are in Jerusalem,
15 Because you have said, “We have made a covenant with death,
And with Sheol we have made a pact.
The overwhelming scourge will not reach us when it passes by,
For we have made falsehood our refuge and we have concealed ourselves with deception.”

“Behold, I am laying in Zion a stone, a tested stone,
A costly cornerstone for the foundation, firmly placed.
He who believes in it will not be disturbed.

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The “cornerstone” reference is clearly is clearly referring to Jesus:

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Matthew 21:42 – Jesus *said to them, “Did you never read in the Scriptures, ‘The stone which the builders rejected,This became the chief corner stone; This came about from the Lord, And it is marvelous in our eyes’?

Mark 12:10 – Have you not even read this Scripture: ‘The stone which the builders rejected, This became the chief corner stone;

Luke 20:17 – But Jesus looked at them and said, “What then is this that is written: ‘The stone which the builders rejected, This became the chief corner stone’?

Acts 4:11 – He is the stone which was rejected by you, the builders, but which became the chief corner stone.

Ephesians 2:20 – having been built on the foundation of the apostles and prophets, Christ Jesus Himself being the corner stone,

1 Peter 2:6 – For this is contained in Scripture: “Behold, I lay in Zion a choice stone, a precious corner stone, And he who believes in Him will not be disappointed.”

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Therefore, God says in Isaiah 28 that He was sending Jesus in response to the rulers in Jerusalem, whom He called scoffers.  The rulers in Jerusalem at the time of Jesus’ arrival were the religious leaders (Scribes, Pharisees, Chief Priest, etc.) – so God was clearly calling them “scoffers”.   And according to Proverbs 21:24, scoffers is one of the names for those filled with insolent pride.

“Proud”, “Haughty”, “Scoffer” are his names, who acts with insolent pride. Proverbs 21:24