ज्ञानयज्ञेन चाप्यन्ये यजन्तो मामुपासते। एकत्वेन पृथक्त्वेन बहुधा विश्वतोमुखम् ॥

jñāna-yajñena chāpyanye yajanto mām upāsate ekatvena pṛithaktvena bahudhā viśhvato-mukham

Others also, sacrificing with the sacrifice of wisdom, worship Me as the One and the Manifold everywhere present.

In plain words: Krishna says others worship him through knowledge, which they offer like a sacrifice. They see him as one God who is also present in many forms, everywhere.