"Chapter 14—“We Have Found the Messias” This chapter is based on John 1:19-51 . John the Baptist was now preaching and baptizing at Bethabara, beyond Jordan. It was not far from this spot that God had stayed the river in its flow until Israel had passed over. A little distance from here the stronghold of Jericho had been overthrown by the armies of heaven. The memory of these events was at this time revived, and gave a thrilling interest to the Baptist's message. Would not He who had wrought so wonderfully in ages past again manifest His power for Israel's deliverance? Such was the thought stirring the hearts of the people who daily thronged the banks of the Jordan. DA 132"
"And this is the record of John, when the Jews sent priests and Levites from Jerusalem to ask him, Who art thou? And he confessed, and denied not; but confessed, I am not the Christ. And they asked him, What then? Art thou Elias? And he saith, I am not. Art thou that prophet? And he answered, No. Then said they unto him, Who art thou? that we may give an answer to them that sent us. What sayest thou of thyself? He said, I am the voice of one crying in the wilderness, Make straight the way of the Lord, as said the prophet Esaias. And they which were sent were of the Pharisees. And they asked him, and said unto him, Why baptizest thou then, if thou be not that Christ, nor Elias, neither that prophet? John answered them, saying, I baptize with water: but there standeth one among you, whom ye know not; He it is, who coming after me is preferred before me, whose shoe’s latchet I am not worthy to unloose. These things were done in Bethabara beyond Jordan, where John was baptizing. The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world. This is he of whom I said, After me cometh a man which is preferred before me: for he was before me. And I knew him not: but that he should be made manifest to Israel, therefore am I come baptizing with water. And John bare record, saying, I saw the Spirit descending from heaven like a dove, and it abode upon him. And I knew him not: but he that sent me to baptize with water, the same said unto me, Upon whom thou shalt see the Spirit descending, and remaining on him, the same is he which baptizeth with the Holy Ghost. And I saw, and bare record that this is the Son of God. Again the next day after John stood, and two of his disciples; And looking upon Jesus as he walked, he saith, Behold the Lamb of God! And the two disciples heard him speak, and they followed Jesus. Then Jesus turned, and saw them following, and saith unto them, What seek ye? They said unto him, Rabbi, (which is to say, being interpreted, Master,) where dwellest thou?"
Ellen White directly references John 1:19-51 in this passage.
"The preaching of John had taken so deep a hold on the nation as to demand the attention of the religious authorities. The danger of insurrection caused every popular gathering to be looked upon with suspicion by the Romans, and whatever pointed toward an uprising of the people excited the fears of the Jewish rulers. John had not recognized the authority of the Sanhedrin by seeking their sanction for his work; and he had reproved rulers and people, Pharisees and Sadducees alike. Yet the people followed him eagerly. The interest in his work seemed to be continually increasing. Though he had not deferred to them, the Sanhedrin accounted that, as a public teacher, he was under their jurisdiction. DA 132.2"
"But when he saw many of the Pharisees and Sadducees come to his baptism, he said unto them, O generation of vipers, who hath warned you to flee from the wrath to come?"
Both passages discuss John the Baptist's ministry and the reaction of the religious authorities (Pharisees and Sadducees) to his preaching. The EGW passage explains the political and religious context surrounding John's ministry, while Matthew 3:7 records John's rebuke of the Pharisees and Sadducees. The EGW passage amplifies the context of the biblical verse.