“Girnar yātrā se bhav–bhāri pāpon kā kṣay hotā hai” is more a lok‑prasiddh vākya (popular devotional line), not a verbatim line from any one Agam or well‑known shāstra.

Jain granths do say:

• Tīrth‑yātrā, vandan, prabhu‑bhakti, tapa, samayik, pratikraman etc. se pāp‑kṣay aur puṇya‑bandh hotā hai.
• Girnar / Revatachal ko shāstron me Nemināth Bhagwān ka dīkṣā, keval‑jñān aur mokṣa‑kṣetra batāyā gayā hai, isliye ise mahātīrth kaha jātā hai.
• Isi adhar par ācāryon ne pravachan, granthon, tirth‑mālāoṅ me Girnar‑yātrā ke mahimā‑vachan likhe hain, jinhe log saṅkṣep me aisī line se bol dete hain.

Lekin jo exact sentence aapne likhā hai, use kisi ek nirdisht granth ke “śabd‑śah” rūp me dikhānā mushkil hai; adhiktar ye pravachan / bhāva‑vachan ke rūp me chaltā hai, na ki ek prasiddh āgamik quote ke rūp me.

Girnar ke Jain dr̥ṣṭi se itihās aur mahimā ke liye yeh sahāyak hai: “Shri Girnar Tirth” aur “Girnar” ke vistār se varṇan ke rūp me tirth māhātmya diyā gayā hai