Who instructs yudhistra in Dharma and neethi in Shanthi parva

Bhishma instructed Yudhishthira on Dharma (righteous duty) and Neeti (statecraft/ethics) in the Shanti Parva (Book of Peace) of the Mahabharata while lying on a bed of arrows. This extensive discourse covers various aspects of governance, morality, duties of kings, and philosophical wisdom. Yudhishthira sought out Bhishma's guidance after the war, concerned about ruling justly. Bhishma's teachings constitute a significant portion of the Shanti Parva and are considered a treasure house of ethical and political wisdom.