Matsya Purana 59.20

59.20

yaścaikamāpa rājendra! vṛkṣaṃ saṃsthāpayennaraḥ.
so'pi svarge vased rājan! yāvadindrāyutatrayam.. 59.17 ..

One who plants even one tree, O King! according to the prescribed rites, resides in heaven for 30,000 years of Indra. The planter of trees, according to the prescribed rites, liberates the same number of his past and future manes and attains the highest perfection, and is never re-born on earth. One who hears or relates to others these prescribed ceremonies goes to the region of Brahmâ and is venerated by the Devas.—17-20.