Agniveshyagrihyasutra 2.5.10.20

2.5.10.20

sayeti kṛṣṇorabhrī radbhirabhyukṣya ādhūnute varṣati yadi śakṛtkaroti vā varṣati yadi palāyate vopaviśati vā na varṣati iti \

If the black ram, having been sprinkled with water, bleats and shakes itself, it will rain; or if it voids dung, it will rain; if it runs away or sits down, it will not rain.