Agniveshyagrihyasutra 2.5.2.1

2.5.2.1

atha yadyakāle sthūṇā virohet va kapoto vāgāramadhye 'dhipated gaurvā gāṃ dhayet gaurātmānaṃ pratyaṅ dhayet anaḍvānvā samullikhet anagnau vā dhūmo jāyeta anagnau vā dīpyeta madhu vā jāyeta niryāsaṃ vopajāyeta chatrākaṃ vopajāyeta maṇḍūko vā bhūmau dadṛśe śvānaḥ prasūte vā gṛhapatiṃ jāyāṃ vopatapati anyeṣu cādbhutotpāteṣu \

Now, if out of season a post sprouts, or a pigeon flies into the middle of the house, or a cow suckles a cow, or a cow turns backward and suckles herself, or a draft-ox scratches [the earth], or smoke arises without fire, or [flame] blazes without fire, or honey appears, or sap oozes out, or a mushroom grows, or a frog is seen on the ground, or a female dog gives birth, or an affliction befalls the master of the house or his wife, and in other wondrous portents—