Srila Prabhupada: Chanting is the medicine, and prasada is the diet. (Srimad-Bhagavatam, 4.7.24 Purport)
One should invite people, chant Hare Krishna, and then distribute prasadam. This yajna will satisfy all the demigods, and thus there will be peace and prosperity in the world. (Srimad-Bhagavatam, 4.6.53 Purport)