Quote Originally Posted by Throbert McGee View Post
But anyway, you should definitely consult with the native speakers here about which variant sounds the most natural/traditional -- I'm just offering some alternatives that I found with Google.
"Помилуй меня, Господи, ибо я грешен"
"Прости меня, Боже, ибо я грешен"
"Прости мне, Боже, ибо я грешен" (archaic)