For this is he who was spoken of by the prophet Isaiah when he said, "The voice of one crying in the wilderness: Prepare the way of the Lord, make his paths straight."

that what was spoken by the prophet Isaiah might be fulfilled:

This was to fulfill what was spoken by the prophet Isaiah: "He took up our infirmities and bore our diseases."

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

In them is fulfilled the prophecy of Isaiah which says: 'Hearing you will hear and shall not understand; and seeing you will see and not perceive.

You hypocrites! Well did Isaiah prophesy about you, when he said:

As it is written in Isaiah the prophet: "Behold, I send my messenger before your face, who will prepare your way";

And he said to them, "Well did Isaiah prophesy of you hypocrites; as it is written: 'This people honors me with their lips, but their heart is far from me.

As it is written in the book of the words of Isaiah the prophet, "The voice of one crying in the wilderness: 'Prepare 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 the voice of one crying in the wilderness, 'Make straight the way of the Lord,' as the prophet Isaiah said."

that the word of Isaiah the prophet might be fulfilled, which he spoke: "Lord, who has believed our report? And to whom has the arm of the Lord been revealed?"

Therefore they could not believe, because Isaiah said again:

Isaiah said this because he saw his glory and spoke of him.

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

So Philip ran up to him, and heard him reading Isaiah the prophet, and asked, "Do you understand what you are reading?"

When they disagreed among themselves, they began to leave, after Paul had made one final statement: "The Holy Spirit spoke the truth to your fathers through Isaiah the prophet:

And Isaiah cries out concerning Israel: "Though the number of the sons of Israel be as the sand of the sea, only the remnant will be saved.

And as Isaiah said: "Unless the Lord of hosts had left us children, we would have become like Sodom, and we would have been made like Gomorrah."

But they have not all obeyed the gospel. For Isaiah says, "Lord, who has believed our message?"

But Isaiah is very bold and says, "I was found by those who did not seek me; I have shown myself to those who did not ask for me."

And again, Isaiah says: "There shall be a root of Jesse; and he who shall rise to rule over the Gentiles, in him the Gentiles shall hope."