Agniveshyagrihyasutra 3.8.2.4

3.8.2.4

athaitatpurastādevaudumbaraṃ yugalāṅgalaṃ kāritaṃ bhavati saptagavaṃ vā śayodaśagavaṃ vā śunaṃ vāhāḥ śunaṃ nārāḥ śunaṃ kṛṣatu lāṅgalam \

Now, previously, a plow with a yoke of udumbara wood has been made, [drawn by] seven oxen or sixteen oxen: "May the draft-animals plow auspiciously, auspiciously the men, auspiciously the plow;