B.G 5.10
brahmaṇyādhāya karmāṇi saṅgaṁ tyaktvā karoti yaḥ। lipyate na sa pāpena padmapatramivāmbhasā ॥10॥
One who performs actions, offering them to Brahman and giving up attachment, is not tainted by sin, just as a lotus leaf is not wetted by water.
Gīta Bhāshya 5.10
The prescribed practice, i.e. renunciation along with Yōga, is a rule and is not just a superficial lip service.
saṁnyāsaYōgayukta eva ca karmaṇā na lipyata ityāha- brahmaṇi iti। sādhananiyamasya upacāratvanivr̥ttyarthaṁ punaḥpunaḥ phalakathanam ॥10॥
Indeed, the renunciation is to be practiced along with Yōga, and such actions don't get tainted with defects, is conveyed by 'brahmaṇi' verse. The prescribed practice, i.e. renunciation along with Yōga, is a rule and is not just a superficial lip service. Hence, repeatedly, its results are emphasized.