BṚHADĀRAṆYAKA UPANISHAD · 6.1.6

यो ह वै प्रजातिं वेद प्रजायते ह प्रजया पशुभिः ।
रेतो वै प्रजातिः ।
प्रजायते ह प्रजया पशुभिः ।
य एवं वेद ॥

yo ha vai prajātiṃ veda prajāyate ha prajayā paśubhiḥ ।
reto vai prajātiḥ ।
prajāyate ha prajayā paśubhiḥ ।
ya evaṃ veda ॥

He who knows generation, becomes rich in offspring and cattle. Seed indeed is generation. He who knows this, becomes rich in offspring and cattle.