Recently while hearing about the importance of sadhachara, I encountered the following interesting statement
Achaara heenan na punanti Veda
Vedas cannot purify the person who does not perform acharas
It is a very useful statement for day-to-day life as many people tend to study scriptures without following acharas. After hearing it, I started searching for the source(s) and found many scriptures.
आचारहीनं न पुनन्ति वेदा यद्यप्यधीता: सह षड्भिरंगै:।
छन्दांस्येनं मृत्युकाले त्यजन्ति नीडं शकुंता इव जातपक्षा:
(वसिष्ठ स्मृति 6/3; देवी भागवत 11/2/1) ref
Achaara heenan na punanti Veda yadyapyadheetah saha shatbhirangaih, shilpam hi Vedadhyayanam Dwijaanam vrutam Smrutam Brahmana lakshmanam tu
So, Vasishta smriti, Devi Bagahavatham, and Bhavishya Purana contain the verse. But on this site, I read that Manu also told the same.
आचार हीनो न पुनन्ति वेदाः (Achara Hino Na Punanthi Vedah) says Manu.
Is it present in Manusmriti? If yes, in which chapter? If not, where did Manu tell this?
Note: I didn't validate personally the ref part of Vashishtha Smriti and Devi Bhagavatam.
