Agniveshyagrihyasutra 2.5.11.2

2.5.11.2

vṛṣṭikāmo 'dhikārī kṛṣṇaṃ vāsaḥ kṛṣṇā gauḥ kṛṣṇayorabhrī kṛṣṇā vrīhayaśca kṛṣṇamadhu cāmā ca kumbhī kharjūrasaktavaśca sarpiśca trīṇi puṣkaraparṇānītyete 'sya sambhārā upaklṛptā bhavanti \

One desiring rain is eligible [to perform it]. A black garment, a black cow, a black ewe, black rice, black honey, an unbaked jar, date-meal, ghee, and three lotus leaves—these ritual requisites are prepared for him.