Markandeyapurana 49.32

49.32

tena vā vartayanti sma mukhe treyāyugasya vai /
tataḥ kālāntareṇaiva punarlobhānvitāstu tāḥ //

Then those trees were called houses[5] by them. But branches certainly fall from other trees, O brāhman; and they yield clothing and ornaments out of their fruits. In the separate cavities of the same fruit of those trees was produced very strong honey, which excelled in smell, colour and taste, and which no bee had made; on that they subsisted at the beginning of the Tretā age.

Afterwards in course of time those people grew covetous besides; their minds being filled with selfishness they fenced the trees[6] round; and those trees perished by reason of that wrong conduct on their part. Strife sprang up in consequence; their faces felt cold and heat and hunger. Then for the sake of combination and resistance they made towns at first; and they resort to fortresses in inaccessible deserts and wastes, in mountains and caves; also they industriously constructed with their own fingers an artificial fort on trees, on mountains and in water, and they first made measures intended for measurement.