Yudhisthira thought that although he was not actually involved in the administration of the kingdom, which was being carried on well by Duryodhana without harm to the citizens, he caused the killing of so many living beings only for his personal gain

Expressions researched:
"Mahārāja Yudhiṣṭhira thought that although he was not actually involved in the administration of the kingdom, which was being carried on well by Duryodhana without harm to the citizens, he caused the killing of so many living beings only for his personal gain of the kingdom from the hands of Duryodhana"

Srimad-Bhagavatam

SB Canto 1

Mahārāja Yudhiṣṭhira thought that although he was not actually involved in the administration of the kingdom, which was being carried on well by Duryodhana without harm to the citizens, he caused the killing of so many living beings only for his personal gain of the kingdom from the hands of Duryodhana.

SB 1.8.50, Translation and Purport

There is no sin for a king who kills for the right cause, who is engaged in maintaining his citizens. But this injunction is not applicable to me.

Mahārāja Yudhiṣṭhira thought that although he was not actually involved in the administration of the kingdom, which was being carried on well by Duryodhana without harm to the citizens, he caused the killing of so many living beings only for his personal gain of the kingdom from the hands of Duryodhana. The killing was committed not in the course of administration but for the sake of self-aggrandizement, and as such he thought himself responsible for all the sins.