"Let those who have used the talent of speech to discourage and dishearten God's servants, who are striving to advance God's cause, planning and working to master hindrance, ask God to forgive them for the injury they have done to His work by their wicked prejudices and unkind words. Let them think of the harm they have done by spreading false reports, by judging those they have no right to judge. 8T 84.1"
"But I say unto you, That every idle word that men shall speak, they shall give account thereof in the day of judgment."
Both passages address the accountability for unkind and harmful words, particularly in the context of judging others.
"In the word of God we are given plain directions as to the course we are to follow when we think a brother is in the wrong. Christ says: “If thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican.” And again the Saviour says: “If thou bring thy gift to the altar, and there rememberest that thy brother hath aught against thee; leave there thy gift before the altar, and go thy way; first be reconciled to thy brother, and then come and offer thy gift.” Matthew 18:15-17 ; 5:23, 24 . 8T 84.2"
"Moreover if thy brother shall trespass against thee, go and tell him his fault between thee and him alone: if he shall hear thee, thou hast gained thy brother. But if he will not hear thee, then take with thee one or two more, that in the mouth of two or three witnesses every word may be established. And if he shall neglect to hear them, tell it unto the church: but if he neglect to hear the church, let him be unto thee as an heathen man and a publican."
EGW directly quotes Matthew 18:15-17 and Matthew 5:23-24 to support her point about dealing with a brother in the wrong.
"“Lord, who shall abide in Thy tabernacle? who shall dwell in Thy holy hill? He that walketh uprightly, and worketh righteousness, and speaketh the truth in his heart. He that backbiteth not with his tongue, nor doeth evil to his neighbor, nor taketh up a reproach against his neighbor. In whose eyes a vile person is contemned; but he honoreth them that fear the Lord. He that sweareth to his own hurt, and changeth not. He that putteth not out his money to usury, nor taketh reward against the innocent. He that doeth these things shall never be moved.” Psalm 15 . 8T 84.3"
"Lord, who shall abide in thy tabernacle? who shall dwell in thy holy hill? He that walketh uprightly, and worketh righteousness, and speaketh the truth in his heart. He that backbiteth not with his tongue, nor doeth evil to his neighbour, nor taketh up a reproach against his neighbour. In whose eyes a vile person is contemned; but he honoureth them that fear the Lord. He that sweareth to his own hurt, and changeth not. He that putteth not out his money to usury, nor taketh reward against the innocent. He that doeth these things shall never be moved."
EGW directly quotes Psalm 15 to illustrate who can abide in God's tabernacle.