अप्रजस्य मनोः पूर्वं वसिष्ठो भगवान्किल ।
मित्रावरुणयोरिष्टिं प्रजार्थमकरोद्विभुः ॥ १३ ॥
aprajasya-of he who had no son; manoh-of Manu; purvam-formerly; vasisthah-the great saint Vasistha; bhagavan-powerful; kila-indeed; mitra-varunayoh-of the demigods named Mitra and Varuna; istim-a sacrifice; praja-artham-for the sake of getting sons; akarot-executed; vibhuh-the great person.
Manu at first had no sons. Therefore, in order to get a son for him, the great saint Vasistha, who was very powerful in spiritual knowledge, performed a sacrifice to satisfy the demigods Mitra and Varuna.