"“Died Abner as a fool dieth? Thy hands were not bound, Nor thy feet put into fetters: As a man falleth before wicked men, So fellest thou.” PP 700.1"
"Thy hands were not bound, nor thy feet put into fetters: as a man falleth before wicked men, so fellest thou. And all the people wept again over him."
EGW directly quotes 2 Samuel 3:34.
"David's magnanimous recognition of one who had been his bitter enemy won the confidence and admiration of all Israel. “All the people took notice of it, and it pleased them: as whatsoever the king did pleased all the people. For all the people and all Israel understood that day that it was not of the king to slay Abner the son of Ner.” In the private circle of his trusted counselors and attendants the king spoke of the crime, and recognizing his own inability to punish the murderers as he desired, he left them to the justice of God: “Know ye not that there is a prince and a great man fallen this day in Israel? And I am this day weak, though anointed king; and these men the sons of Zeruiah be too hard for me: the Lord shall reward the doer of evil according to his wickedness.” PP 700.2"
"Dearly beloved, avenge not yourselves, but rather give place unto wrath: for it is written, Vengeance is mine; I will repay, saith the Lord."
The EGW passage describes David leaving the punishment of the murderers to God, which aligns with the principle of Romans 12:19 about not avenging oneself and leaving vengeance to God.