तुर्यं छेदविरोहेण वरेण जगृहुर्द्रुमाः ।
तेषां निर्यासरूपेण ब्रह्महत्या प्रदृश्यते ॥ ८ ॥
turyam-one fourth; cheda-although being cut; virohena-of growing again; varena-because of the benediction; jagrhuh-accepted; drumah-the trees; tesam-of them; niryasa-rupena-by the liquid oozing from the trees; brahma-hatya-the reaction for killing a brahmana; pradrsyate-is visible.
In return for Indra's benediction that their branches and twigs would grow back when trimmed, the trees accepted one fourth of the reactions for killing a brahmana. These reactions are visible in the flowing of sap from trees. [Therefore one is forbidden to drink this sap.]