وَهُوَ عِنْدِي كَثِيرٌ وَهُوَ عَلَيْكَ سَهْلٌ…
Source: Source: duas.org · ramadan-dua-iftitah
wa huwa `indi kathirun wa huwa `alayka sahlun yasirun allahumma inna `afwaka `an dhanbi wa tajawuzaka `an khati'ati wa safhaka `an zulmi wa sitraka `ala qabihi `amali wa hilmaka `an kathiri jurmi `inda ma kana min khata'i wa `amdi atma`ani fi an as'alaka ma la astawjibuhu minka alladhi razaqtani min rahmatika wa araytani min qudratika wa `arraftani min ijabatika
For me, it is so big but for You, it is effortless and easy. O Allah, as You pardon my sins, overlook my mistakes, take a lenient view of my disorderly conduct, cover up my hideous actions, and treat my numerous offenses with forbearance, which I have committed mistakenly and willfully— all that tempted me to ask for that which I do not deserve from You, that is You may grant me part of Your mercy, show me part of Your all-powerfulness, and show me signals of Your response to me.
Reference / Source
Source: duas.org · ramadan-dua-iftitah