What precepts do you mean? Lay precepts are for life, bodhisattva precepts are until buddhahood, monastic precepts are for life. What you can give back are the monastic (Vinaya) precepts, but to be re-ordained it takes the community to approve it. Otherwise you don't lose the other vows. You can do repentance on your own of course, and remind yourself of the vows you took.
"If the Buddha-Nature is seen, there will be no seeing of a nature in any thing."
(Nirvana Sutra, T12n374p521b3; tr Yamamoto)
"Neither cultivation nor seated meditation — this is the pure Chan of Tathagata."
(Mazu Daoyi, X1321p3b23; tr. Jinhua Jia)
“Don’t rashly seek the true Buddha;
True Buddha can’t be found.
Does marvelous nature and spirit
Need tempering or refinement?
Mind is this mind carefree;
This face, the face at birth."
(Nanyue Mingzan: Enjoying the Way, tr. Jeff Shore; T2076p461b24-26)