bhakta-pada-dhūli - the dust of the lotus feet of a devotee; āra - and; bhakta-pada-jala - the water that washed the feet of a devotee; bhakta-bhukta-avaśeṣa - and the remnants of food eaten by a devotee; tina - three; mahā-bala - very powerful.

The dust of the feet of a devotee, the water that has washed the feet of a devotee, and the remnants of food left by a devotee are three very powerful substances.