Bhagavad Gita 2.46 Chapter 2, Verse 46

यावानर्थ उदपाने सर्वतः संप्लुतोदके ।
तावान्सर्वेषु वेदेषु ब्राह्मणस्य विजानतः ॥२.४६॥

yāvānartha udapāne sarvataḥ saṃplutodake
tāvānsarveṣu vedeṣu brāhmaṇasya vijānataḥ

Meaning

For a knower of Brahman, all the Vedas (their rituals) are of as much use as a small well when there is a flood of water everywhere.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 2.46 (Chapter 2, The Yoga of Knowledge (Sankhya Yoga), Verse 46)