मित्रावरुणयोरिष्टिं प्रजार्थमकरोद् विभु: ॥ १३ ॥
vasiṣṭho bhagavān kila
prajārtham akarod vibhuḥ
aprajasya — of he who had no son; manoḥ — of Manu; pūrvam — formerly; vasiṣṭhaḥ — the great saint Vasiṣṭha; bhagavān — powerful; kila — indeed; mitrā-varuṇayoḥ — of the demigods named Mitra and Varuṇa; iṣṭim — a sacrifice; prajā-artham — for the sake of getting sons; akarot — executed; vibhuḥ — the great person.
Manu at first had no sons. Therefore, in order to get a son for him, the great saint Vasiṣṭha, who was very powerful in spiritual knowledge, performed a sacrifice to satisfy the demigods Mitra and Varuṇa.