Sadhus should be careful to avoid offenses. Before accepting prasādam we chant this verse from Mahābhārata:

mahā-prasāde govinde nāma-brahmaṇi vaiṣṇave
svalpa-puṇyavatāṁ rājan viśvāso naiva jāyate

svalpa-puṇyavatāṁ — the doubtful, who are saṁśayātmā, who have no faith in kṛṣṇa-nāma, the brāhmaṇas, sadhus, and mahā-prasād, will be vina-śyati, vanquished. Prasāda is not mere rice, dal and vegetables. No, no! It is mahā-prasāda, great prasāda, great mercy! Raghunath Das Goswami was collecting the thrown out jagannātha-prasāda from the drain — because it is transcendental. It is not material at all. One should have full faith in this. The mahā-prasāda, the deity form of Govinda, the holy name of Krishna, the brahmanas and the vaiṣṇavas — the śuddha bhaktas, pure devotees — are transcendental. This is a question of faith. One who has any doubts about this will commit offenses and suffer. One must accept these with full faith. Otherwise he will definitely be punished.