The works of Ādi Śaṅkarācārya

Sanatsujātīyam

p. 210

p. 210

भजत्यव्यभिचारेण परमात्मानमच्युतम् ।

In plain words

One worships with unwavering devotion the infallible Supreme Self.

Close to the Sanskrit

He worships without deviation the imperishable Supreme Self.