Forgiveness Prayer
Instruction: This is to be recited 1 (one) times while bowing to Lord Śiva. [Bow to the Śiva Liñga.]
कर चरण क्रितं वाक्कायजं कर्मजं वा
श्रवण नयनजं वा मानसं वापराधम्।
विहितमविहितं वा सर्वमेतत्क्षमस्व
जय जय करुणाब्दे ष्री महादेव षम्भो॥
kara caraṇa kritaṁ vākkāyajaṁ karmajaṁ vā
śravaṇa nayanajaṁ vā mānasaṁ vāparādham |
vihitamavihitaṁ vā sarvametatkṣamasva
jaya jaya karuṇābde ṣrī mahādeva ṣambho ||
Meaning: Whatever sins (faults) committed, by hand or foot, in word or deed, with ears or eyes, in mind or body, knowingly or unknowingly, may I be forgiven for all them, by the ever victorious Śrī Mahādeva (Śiva) who is Sambhu (self manifested)
~Verse 16, Shiva Aparadha Kshama Stotra by Adi Śaṅkara Bhagavatpāda
http://srath.com/topics/mantra-sastra/mantra/