Certainly! In Jainism, Samayik is a ritual of equanimity and meditation performed by lay followers (Shravaks) and monks. Before starting Samayik, one takes a vow called Pachchhakhān (Pachkaan), which is a formal statement of intent.

Here is the traditional Pachchhakhān Gatha (in Prakrit with its meaning):

Prakrit: ``` इच्छामि समाइयं समाइएणं कुसलधम्मं पच्चखाणेमि। इच्छामि खमासमणं समणसमुद्देसं, णंमोक्करं।। ```

Gujarati (Romanized): ``` Icchāmi samāiyaṃ samāiyaeṇaṃ kusaladhammam pacchakkhāṇemi. Icchāmi khamāsamaṇaṃ samaṇasamuddesaṃ, ṇamokkaraṃ. ```

Meaning in English: "I desire to perform Samayik; I take the vow to observe Samayik for the given period, renouncing sinful activities. I seek forgiveness from all ascetics, monks, and nuns, and I bow to them."

Typical Samayik Pachkaan (in Gujarati): ``` હું અમુક સમય માટે સમાયક કરવાનું પચ્ચાખાણું લેવું છું. આ સમય દરમ્યાન હું પાપ કર્મો, પાપ ભાવ, પાપ વચન, પાપ કાયા થી દૂર રહીશ. હું મન, વચન, કાયા થી સમતા ધારણ કરીશ. ```

If you want the formal Pachkaan, it's usually recited as above. Some sects or traditions may have slight variations, but this is the essence.

If you need the full text in any particular script or want a specific tradition’s version, please let me know!