Puññā-dhārā: 'streams of merit'. It is said that one produces 4 streams of merit by offering the 4 requisites robes, foodfood, dwelling, medicine to a Bhikkhu who has reached the conditionless deliverance of mind; further by being filled with unshakable faith in the Buddha, his doctrine and community of disciples, and by being perfect in morality A. IV, 51, 52. A. VIII, 39 describes 4 further streams of merit.
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.