"“Judah, thou art he whom thy brethren shall praise: Thy hand shall be in the neck of thine enemies; Thy father's children shall bow down before thee. Judah is a lion's whelp: From the prey, my son, thou art gone up: He stooped down, he couched as a lion, And as an old lion: who shall rouse him up? The scepter shall not depart from Judah, Nor a lawgiver from between his feet, Until Shiloh come; And unto Him shall the gathering of the people be.” PP 236.2"
"Judah, thou art he whom thy brethren shall praise: thy hand shall be in the neck of thine enemies; thy father’s children shall bow down before thee."
EGW directly quotes Genesis 49:8.
"The lion, king of the forest, is a fitting symbol of this tribe, from which came David, and the Son of David, Shiloh, the true “Lion of the tribe of Judah,” to whom all powers shall finally bow and all nations render homage. PP 236.3"
"And one of the elders saith unto me, Weep not: behold, the Lion of the tribe of Juda, the Root of David, hath prevailed to open the book, and to loose the seven seals thereof."
EGW explicitly alludes to Revelation 5:5, referencing the "Lion of the tribe of Judah" and connecting it to David and Shiloh.
"And shot at him, and hated him: But his bow abode in strength, And the arms of his hands were made strong By the hands of the mighty God of Jacob; (From thence is the shepherd, the stone of Israel;). Even by the God of thy father, who shall help thee; And by the Almighty, who shall bless thee With blessings of heaven above, Blessings of the deep that lieth under, Blessings of the breasts, and of the womb: The blessings of thy father have prevailed Above the blessings of my progenitors Unto the utmost bound of the everlasting hills: They shall be on the head of Joseph, And on the crown of the head of him that was separate from his brethren.” PP 236.5"
"Joseph is a fruitful bough, even a fruitful bough by a well; whose branches run over the wall:"
The EGW passage directly quotes Genesis 49:22-26, making it a clear and explicit allusion.