"Moses arises from his humiliating position and enters the tabernacle to commune with God. Then the Lord proposes to immediately destroy this rebellious people. He desires to make of Moses a greater nation than Israel; but the meek leader of His people will not consent to this proposition. “And Moses said unto the Lord, Then the Egyptians shall hear it, (for Thou broughtest up this people in Thy might from among them;) and they will tell it to the inhabitants of this land: for they have heard that Thou Lord art among this people, that Thou Lord art seen face to face, and that Thy cloud standeth over them, and that Thou goest before them, by daytime in a pillar of a cloud, and in a pillar of fire by night. Now if Thou shalt kill all this people as one man, then the nations which have heard the fame of Thee will speak, saying, Because the Lord was not able to bring this people into the land which He sware unto them, therefore He hath slain them in the wilderness.” 4T 152.1"
"Now therefore let me alone, that my wrath may wax hot against them, and that I may consume them: and I will make of thee a great nation."
The EGW passage directly quotes Moses's plea from Numbers 14 (though it conflates it with Exodus 32) and references God's initial intention to destroy Israel and make a great nation of Moses, as stated in Exodus 32:10. The quote is a clear and direct connection.
"Moses again refuses to have Israel destroyed and himself made a mightier nation than they. This favored servant of God manifests his love for Israel and shows his zeal for the glory of his Master and the honor of His people. Thou hast forgiven this people from Egypt even until now; Thou hast been long-suffering and merciful hitherto toward this ungrateful nation; and however unworthy they may be, Thy mercy is the same. He pleads: Wilt Thou not therefore spare them this one, and add this one more instance of divine patience to the many Thou hast already given? 4T 152.2"
"Pardon, I beseech thee, the iniquity of this people according unto the greatness of thy mercy, and as thou hast forgiven this people, from Egypt even until now."
The EGW passage closely paraphrases Moses's plea for forgiveness in Numbers 14:19, specifically mentioning God's forgiveness from Egypt until that point. The language and sentiment are nearly identical.
"Moses prevailed with God to spare the people, but because of their arrogance and unbelief the Lord could not go with them to work in a miraculous manner in their behalf. Therefore in His divine mercy He bade them adopt the safest course and turn back into the wilderness toward the Red Sea. He also decreed that, as a punishment for their rebellion, all the adults who left Egypt, with the exception of Caleb and Joshua, should be forever excluded from Canaan. They had utterly failed to keep their promise of obedience to God, and this released Him from the covenant that they had so repeatedly violated. He promised that their children should possess the goodly land, but declared that their own bodies should be buried in the wilderness. And the ten unfaithful spies, whose evil report had caused Israel to murmur and rebel, were destroyed by the power of God before the eyes of the people. 4T 152.3"
"Because all those men which have seen my glory, and my miracles, which I did in Egypt and in the wilderness, and have tempted me now these ten times, and have not hearkened to my voice; Surely they shall not see the land which I sware unto their fathers, neither shall any of them that provoked me see it:"
The EGW passage summarizes the consequences of Israel's rebellion as described in Numbers 14:22-23, including the exclusion of the adults from Canaan and the death of the ten spies. It's a direct consequence and fulfillment of the prophecy.