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.