दध्नः सोम्य मथ्यमानस्य योऽणिमास ऊर्ध्वः समुदीषति तत्सर्पिर्भवति ॥ १ ॥
In plain words
When curd is churned, my dear, the subtlest part of it rises to the top and turns into butter.
Close to the Sanskrit
Of curd, my dear, being churned, whichever is the subtlety, that rising upward comes forth, that becomes butter.