Laws-a-mercy

"Laws-a-mercy!" exclaimed the old lady," I wonder if you kin tell true?" "The science never fails," replied a voice we had heard before. "Will you choose clairvoyance or the cards?" "It does not matter a mite to me."

Source: wiktionary

"Laws-a-mercy! I gets eight pounds, and Mrs. Jones, thirty pounds and perquisites; and you, a young lady, that knows so much. Laws-a-mercy! what a shame."

Source: wiktionary

"[...] laws-a-mercy! Laws-a-mercy! What shall we do? Everybody that can get away will light out, and who will hep those that have to stay?"

Source: wiktionary