"Let Christ's methods be followed in dealing with those who make mistakes. Unwise actions, the manifestation of undue severity on the part of the teacher, may thrust a student upon Satan's battleground. Prodigals have been kept out of the kingdom of God by the un-Christlikeness of those who claimed to be Christians. “Whoso shall offend one of these little ones which believe in Me,” Christ said, “it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.” Matthew 18:6 . It were better not to live than to exist day by day devoid of that love which Christ has enjoined upon His children. CT 266.1"
"But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea."
Ellen White directly references Matthew 18:6 in this passage.