For this is the one referred to by Isaiah the prophet when he said,
“The voice of one crying in the wilderness,
‘Make ready the way of the Lord,
Make His paths straight!’”

This was to fulfill what was spoken through Isaiah the prophet:

This was to fulfill what was spoken through Isaiah the prophet: “He Himself took our infirmities and carried away our diseases.”

This was to fulfill what was spoken through Isaiah the prophet:

In their case the prophecy of Isaiah is being fulfilled, which says,
‘You will keep on hearing, but will not understand;
You will keep on seeing, but will not perceive;

You hypocrites, rightly did Isaiah prophesy of you:

As it is written in Isaiah the prophet:
“Behold, I send My messenger ahead of You,
Who will prepare Your way;

And He said to them, “Rightly did Isaiah prophesy of you hypocrites, as it is written:
‘This people honors Me with their lips,
But their heart is far away from Me.

as it is written in the book of the words of Isaiah the prophet,
“The voice of one crying in the wilderness,
‘Make ready the way of the Lord,
Make His paths straight.

And the book of the prophet Isaiah was handed to Him. And He opened the book and found the place where it was written,

He said, “I am a voice of one crying in the wilderness, ‘Make straight the way of the Lord,’ as Isaiah the prophet said.”

This was to fulfill the word of Isaiah the prophet which he spoke: “Lord, who has believed our report? And to whom has the arm of the Lord been revealed?”

For this reason they could not believe, for Isaiah said again,

These things Isaiah said because he saw His glory, and he spoke of Him.

and he was returning and sitting in his chariot, and was reading the prophet Isaiah.

Philip ran up and heard him reading Isaiah the prophet, and said, “Do you understand what you are reading?”

And when they did not agree with one another, they began leaving after Paul had spoken one parting word, “The Holy Spirit rightly spoke through Isaiah the prophet to your fathers,

Isaiah cries out concerning Israel, “Though the number of the sons of Israel be like the sand of the sea, it is the remnant that will be saved;

And just as Isaiah foretold,
“Unless the Lord of Sabaoth had left to us a posterity,
We would have become like Sodom, and would have resembled Gomorrah.”

However, they did not all heed the good news; for Isaiah says, “Lord, who has believed our report?”

And Isaiah is very bold and says,
“I was found by those who did not seek Me,
I became manifest to those who did not ask for Me.”

Again Isaiah says,
“There shall come the root of Jesse,
And He who arises to rule over the Gentiles,
In Him shall the Gentiles hope.”