Matsya Purana 58.58

58.58

mantratastu viśeṣaḥ syāt prasādodyānabhūmiṣu.
ayantvaśaktāvarddhena vidhirdrṛṣṭaḥ svayambhuvā.
alpeṣvekāgnivat kṛtvā vittaśāṭhyādrṛte nṛṇām.. 58.52 ..

As to the consecration of palaces, groves, lands and buildings, the ritual formulae are somewhat different from the consecration of tanks. Lord Brahmâ has prescribed these rites for the wealthy. Forty people, in less favourable circumstances, should follow the Ekâgni rites, without giving way to miserliness.—52.