Śatapatha Brāhmaṇa ("of a hundred paths") 9.1.2.5

9.1.2.5

aśmannūrjam parvate śiśriyāṇāmiti | aśmani vā eṣorkparvateṣu śritā yadāpo 'dbhya oṣadhībhyo vanaspatibhyo adhi sambhṛtam paya ityetasmāddhyetatsarvasmādadhi sambhṛtam payastāṃ na iṣamūrjaṃ dhatta marutaḥ saṃrarāṇā iti maruto vai varṣasyeśate 'śmaṃste kṣuditi nidadhāti tadaśmani kṣudhaṃ dadhāti tasmādaśmānādyo 'tho sthiro vā aśmā sthirā kṣutsthira eva tatsthiraṃ dadhāti mayi ta ūrgityapādatte tadātmannūrjaṃ dhatte tathā dvitīyaṃ tathā tṛtīyam

[He sprinkles the stone, with, Vâg. S. XVII, 1], 'The food that is lying in the rock, in the mountain,'--for that food, water, is indeed contained in the rock, in the mountains;--'the drink that is gathered from waters, plants and trees,'--for from all that that drink is indeed gathered;--'that sap and food bring ye unto us, O Maruts, as bountiful givers!'--for the Maruts are the rulers of the rain. With 'In the rock is thy hunger,' he (after watering the altar) sets down (the pitcher on the stone): he thus lays hunger into the stone, whence the stone is not fit for eating. But hard also is the stone, and hard is hunger: he thus puts the hard along with the hard. With, 'In me thy food!' he takes up (the pitcher): he thereby takes up the food into his own self. Thus (he does) a second and a third time.