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 brāhmaṇa. These reactions are visible in the flowing of sap from trees. [Therefore one is forbidden to drink this sap.]
PURPORT
This verse has not purport by His Divine Grace A.C. Bhaktivedanta Svāmi Prabhupāda.