The works of Ādi Śaṅkarācārya

Viṣṇusahasranāmastotram

Verse 239

हरिरेकः सदा ध्येयो भवद्भिः सत्त्वसंस्थितैः ।ओमित्येवं सदा विप्राः पठत ध्यात केशवम् ॥

In plain words

Hari alone, always — he is the one you are to meditate on, you who stand steady in sattva. Begin with Om, and go on beginning with it: recite, brahmins, and hold Keśava in your mind.

Close to the Sanskrit

Hari alone is always to be meditated upon by you who are firmly established in sattva. 'Om' — thus, always, O brahmins, recite; meditate upon Keśava.