The Vajasaneyi Samhita of the Shukla Yajurveda contains several question-and-answer sessions among the priests in which metaphysical and theological riddles are indicated. Here’s one session in which the priest who is the hotr (the one who recites the invocations and litanies during the yajna) asks:
Who wonders lonely on his way?
Who is constantly born anew?
What is the remedy for cold?
What is the great corn vessel called?
The priest who is the adhvaryu (the one who manages the physical details of the yajna) replies:
The sun wanders lonely on its way,
The moon is constantly born anew,
Fire is the remedy for cold,
The earth is the great grain-vessel.
The Vedic sage Yajnavalkya (who is dated between the 8th century BCE and 7th century BCE) is the founder of the Vajasaneyi branch. The word “Vajasaneyi” is a patronymic of Yajnavalkya.